Quarterly report pursuant to Section 13 or 15(d)

Note 13 - Lease Financing Obligations (Details Textual)

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Note 13 - Lease Financing Obligations (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2015
Oct. 31, 2014
Jul. 31, 2012
Jan. 01, 2017
Dec. 27, 2015
Jan. 01, 2017
Dec. 27, 2015
Mar. 27, 2016
Repayments of Long-term Capital Lease Obligations           $ 2,783,000 $ 2,294,000  
Asset Impairment Charges       $ 0 1,519,000  
Restructuring Costs           1,148,000 $ 905,000  
Design Tool Impairment [Member]                
Restructuring Costs       $ 400,000   $ 400,000    
Capital Lease Obligations [Member] | Minimum [Member]                
Debt Instrument, Interest Rate, Effective Percentage       2.00%   2.00%    
Capital Lease Obligations [Member] | Maximum [Member]                
Debt Instrument, Interest Rate, Effective Percentage               7.25%
January Two Thousand Fifteen Two-Year And Two Three-Year License [Member]                
Repayments of Long-term Capital Lease Obligations $ 1,000,000              
October 2014 Three-Year License [Member]                
Repayments of Long-term Capital Lease Obligations   $ 1,500,000            
Property, Plant and Equipment, Net [Member] | January Two Thousand Fifteen Two-Year And Two Three-Year License [Member]                
Capital Lease Obligations Incurred $ 6,900,000              
Property, Plant and Equipment, Net [Member] | October 2014 Three-Year License [Member]                
Capital Lease Obligations Incurred   $ 4,400,000            
Property, Plant and Equipment, Net [Member] | July 2012 Three-Year License [Member]                
Capital Lease Obligations Incurred     $ 900,000