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Note 10 - Segment Information (Details) - Schedule of Segment Reporting Information, by Segment - USD ($)
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]    
Net sales $ 3,542,077 $ 5,342,369
Cost of sales 2,300,787 3,465,716
Gross margin 1,241,290 1,876,653
Engineering, research, and development 615,273 584,877
Selling, general and administrative 706,286 768,230
Litigation costs 382,512 143,514
Amortization of deferred financing costs 1,357 1,356
Change in fair value of common stock warrants (95,000) (217,203)
Proceeds from life insurance (92,678) 0
Interest (income) expense, net 9,631 17,826
Total expenses 1,527,381 1,298,600
Income (loss) before income taxes (286,091) 578,053
Avionics Government [Member]    
Segment Reporting Information [Line Items]    
Net sales 2,972,326 4,871,620
Cost of sales 1,815,153 3,104,918
Gross margin 1,157,173 1,766,702
Avionics Commercial [Member]    
Segment Reporting Information [Line Items]    
Net sales 569,751 470,749
Cost of sales 485,634 360,798
Gross margin 84,117 109,951
Avionics Total [Member]    
Segment Reporting Information [Line Items]    
Net sales 3,542,077 5,342,369
Cost of sales 2,300,787 3,465,716
Gross margin 1,241,290 1,876,653
Engineering, research, and development 615,273 584,877
Selling, general and administrative 358,667 343,882
Amortization of deferred financing costs 0 0
Change in fair value of common stock warrants 0 0
Interest (income) expense, net 0 0
Total expenses 973,940 928,759
Income (loss) before income taxes 267,350 947,894
Corporate Segment [Member]    
Segment Reporting Information [Line Items]    
Net sales 0 0
Cost of sales 0 0
Gross margin 0 0
Engineering, research, and development 0 0
Selling, general and administrative 347,619 424,348
Litigation costs 382,512 143,514
Amortization of deferred financing costs 1,357 1,356
Change in fair value of common stock warrants (95,000) (217,203)
Proceeds from life insurance (92,678)  
Interest (income) expense, net 9,631 17,826
Total expenses 553,441 369,841
Income (loss) before income taxes $ (553,441) $ (369,841)