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Note 8 - Segment Information (Details) - Schedule of Segment Reporting Information, by Segment - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]        
Net sales $ 5,076,029 $ 6,818,390 $ 10,418,398 $ 12,664,309
Cost of sales 3,250,441 4,574,924 6,716,157 8,605,548
Gross margin 1,825,588 2,243,466 3,702,241 4,058,761
Engineering, research, and development 583,771 443,656 1,168,648 935,788
Selling, general and administrative 875,138 883,876 1,786,882 1,749,564
Amortization of deferred financing costs 1,357 1,358 2,713 2,715
Change in fair value of common stock warrants (34,000) 518,588 (251,203) 450,828
Interest (income) expense, net 17,507 25,835 35,333 55,469
Total expenses 1,443,773 1,873,313 2,742,373 3,194,364
Income (loss) before income taxes 381,815 370,153 959,868 864,397
Avionics Government [Member]        
Segment Reporting Information [Line Items]        
Net sales 4,338,764 6,328,752 9,210,384 11,590,071
Cost of sales 2,665,561 4,235,118 5,770,479 7,796,712
Gross margin 1,673,203 2,093,634 3,439,905 3,793,359
Avionics Commercial [Member]        
Segment Reporting Information [Line Items]        
Net sales 737,265 489,638 1,208,014 1,074,238
Cost of sales 584,880 339,806 945,678 808,836
Gross margin 152,385 149,832 262,336 265,402
Avionics Total [Member]        
Segment Reporting Information [Line Items]        
Net sales 5,076,029 6,818,390 10,418,398 12,664,309
Cost of sales 3,250,441 4,574,924 6,716,157 8,605,548
Gross margin 1,825,588 2,243,466 3,702,241 4,058,761
Engineering, research, and development 583,771 443,656 1,168,648 935,788
Selling, general and administrative 346,108 344,951 689,990 705,580
Amortization of deferred financing costs 0 0 0 0
Change in fair value of common stock warrants 0 0 0 0
Interest (income) expense, net 0 0 0 0
Total expenses 929,879 788,607 1,858,638 1,641,368
Income (loss) before income taxes 895,709 1,454,859 1,843,603 2,417,393
Corporate Segment [Member]        
Segment Reporting Information [Line Items]        
Net sales 0 0 0 0
Cost of sales 0 0 0 0
Gross margin 0 0 0 0
Engineering, research, and development 0 0 0 0
Selling, general and administrative 529,030 538,925 1,096,892 1,043,984
Amortization of deferred financing costs 1,357 1,358 2,713 2,715
Change in fair value of common stock warrants (34,000) 518,588 (251,203) 450,828
Interest (income) expense, net 17,507 25,835 35,333 55,469
Total expenses 513,894 1,084,706 883,735 1,552,996
Income (loss) before income taxes $ (513,894) $ (1,084,706) $ (883,735) $ (1,552,996)