Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Stock-based Compensation (Details Textual)

v3.6.0.2
Note 11 - Stock-based Compensation (Details Textual)
1 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 2016
shares
Jul. 31, 2016
shares
Jan. 31, 2014
shares
Oct. 31, 2013
shares
Mar. 31, 2012
shares
Jan. 31, 2012
shares
Jan. 31, 2012
Jan. 01, 2017
USD ($)
$ / shares
shares
Jul. 03, 2016
USD ($)
Dec. 27, 2015
USD ($)
Dec. 31, 2014
shares
Jan. 01, 2017
USD ($)
$ / shares
Rate
shares
Dec. 27, 2015
USD ($)
Dec. 28, 2014
Mar. 27, 2016
USD ($)
$ / shares
shares
Sep. 18, 2014
shares
Jun. 30, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number               5,474,151       5,474,151     7,722,383    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               4,500,000       4,500,000          
Share Price | $ / shares               $ 10.78       $ 10.78     $ 5.26    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                       1,466,800          
Allocated Share-based Compensation Expense | $               $ 3,634,000   $ 811,000   $ 7,131,000 $ 3,810,000        
Accrued Bonuses, Current | $               1,200,000       $ 1,200,000     $ 1,200,000    
Restricted Stock Units (RSUs) [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                       622,039          
Chief Executive Officer [Member] | Employee Stock Option [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     140,000     480,000                      
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Number of Installments             4                    
Allocated Share-based Compensation Expense, Adjustment | $                             (34,000)    
Chief Executive Officer [Member] | Performance Shares [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 280,000                                
Chief Executive Officer [Member] | Performance-based RSUs [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Number of Installments         3                        
Allocated Share-based Compensation Expense, Adjustment | $                             $ (41,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         3 years                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   60,000     300,000                        
Chief Financial Officer [Member] | Performance Shares [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 120,000                                
Allocated Share-based Compensation Expense | $                       $ 200,000          
Chief Financial Officer [Member] | Performance-based RSUs [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   30,000                              
Chief Executive Officer and Chief Financial Officer [Member] | Performance Shares [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years                                
Chief Executive Officer and Chief Financial Officer [Member] | Performance-based RSUs [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years                              
Allocated Share-based Compensation Expense | $               56,000       $ 80,000          
Chief Executive Officer and Chief Financial Officer [Member] | Performance-based RSUs [Member] | Share-based Compensation Award, Tranche One [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year                              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   33.33%                              
Chief Executive Officer and Chief Financial Officer [Member] | Performance-based RSUs [Member] | Share-based Compensation Award, Tranche Two [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   2 years                              
Former Cadeka Employees [Member]                                  
Former Employees, Number                             5    
Payments to Employees | $                             $ 75,000    
Employees Unsettled, Number                       2          
Former Cadeka Employees [Member] | Other Current Liabilities [Member]                                  
Accrued Bonuses, Current | $               1,200,000       $ 1,200,000          
Former Cadeka Employees [Member] | Restricted Stock Units (RSUs) [Member]                                  
Allocated Share-based Compensation Expense | $                         200,000        
Certain Executives [Member] | October 2013 PRSUs [Member]                                  
Allocated Share-based Compensation Expense | $               5,000   $ 18,000   42,000 $ 96,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       70,000                          
Number of Executives Terminated                           1      
Certain Executives [Member] | October 2013 PRSUs [Member] | Share-based Compensation Award, Tranche One [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Number of Installments       3                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years                          
Certain Executives [Member] | October 2013 PRSUs [Member] | Share-based Compensation Award, Tranche Two [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Number of Installments       3                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years                          
Former IML Employees [Member] | Performance-based RSUs [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Number of Installments                     3            
Allocated Share-based Compensation Expense, Adjustment | $                 $ (311,000)                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                     3 years            
Allocated Share-based Compensation Expense | $               $ 200,000       $ 700,000          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                     88,448            
Employee Stock Participation Plan [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent | Rate                       95.00%          
2006 Plan and Sipex 2006 Plan [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number                                 6,555,492
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                                 669,008
2014 Plan [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                               5,170,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Per Award                       2          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant               3,300,000       3,300,000          
The 2017 Incentive Program [Member]                                  
Allocated Share-based Compensation Expense | $                       $ 2,200,000