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Note 15 - Commitments and Contingencies (Details Textual) - USD ($)
3 Months Ended 11 Months Ended 12 Months Ended
Apr. 07, 2017
Mar. 03, 2017
Apr. 02, 2017
Apr. 02, 2017
Dec. 31, 2016
Apr. 03, 2016
Standard and Extended Product Warranty Accrual     $ 654,000 $ 654,000 $ 856,000  
Extended Product Warranty Accrual, Increase for Warranties Issued     94,000   162,000  
Defined Contribution Plan, Cost   $ 20,000        
Purchase Obligation     11,837,000 11,837,000    
Accrual for Environmental Loss Contingencies     $ 0 0 $ 0  
Tampa Facility Litigation [Member]            
Cost of Property Repairs and Maintenance       $ 52,000    
Tampa Facility Litigation [Member] | Subsequent Event [Member]            
Litigation Settlement, Expense $ 448,000          
Accrued Liabilities [Member] | Tampa Facility Litigation [Member]            
Loss Contingency Accrual           $ 500,000
Link Encryption Products [Member] | Minimum [Member]            
Extended Product Warranty Term     3 years      
Link Encryption Products [Member] | Maximum [Member]            
Extended Product Warranty Term     5 years