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Note 14 - Commitments and Contingencies (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
Apr. 05, 2015
Oct. 04, 2015
Sep. 28, 2014
Dec. 31, 2014
Minimum [Member] | Link Encryption Products [Member]          
Extended Product Warranty Term   3 years      
Maximum [Member] | Link Encryption Products [Member]          
Extended Product Warranty Term   5 years      
Scenario, Forecast [Member] | Tampa Facility [Member]          
Lessee Leasing Arrangements, Operating Leases, Renewal Term 5 years        
Product Warranty Accrual     $ 808,000   $ 825,000
Product Warranty Expense     112,000 $ 108,000  
Extended Product Warranty Accrual, Warranties Issued     579,000   $ 839,000
Purchase Obligation     $ 6,515,000