Note 11 - Segment Information (Details) - Schedule of Segment Reporting Information, by Segment - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 2,625,793	$ 4,236,519	$ 7,955,035	$ 14,654,917
Cost of sales	1,689,113	2,602,268	5,377,195	9,318,425
Gross margin	936,680	1,634,251	2,577,840	5,336,492
Engineering, research, and development	546,691	615,007	1,691,631	1,783,655
Selling, general and administrative	548,391	582,880	1,881,072	2,042,922
Litigation costs	134,765	282,490	560,610	609,330
Legal damages	30,523	0	2,130,523	0
Amortization of deferred financing costs	649	1,359	3,363	4,072
Change in fair value of common stock warrants	(5,000)	(37,000)	(95,000)	(288,203)
Proceeds from life insurance	0	0	(92,678)	0
Interest expense, net	14,097	11,620	38,435	46,953
Total expenses	1,270,116	1,456,356	6,117,956	4,198,729
Income (loss) before income taxes	(333,436)	177,895	(3,540,116)	1,137,763
Avionics Government [Member]
Segment Reporting Information [Line Items]
Net sales	1,825,744	3,771,384	5,826,763	12,981,768
Cost of sales	1,013,481	2,297,157	3,489,223	8,067,636
Gross margin	812,263	1,474,227	2,337,540	4,914,132
Avionics Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	800,049	465,135	2,128,272	1,673,149
Cost of sales	675,632	305,111	1,887,972	1,250,789
Gross margin	124,417	160,024	240,300	422,360
Avionics Total [Member]
Segment Reporting Information [Line Items]
Net sales	2,625,793	4,236,519	7,955,035	14,654,917
Cost of sales	1,689,113	2,602,268	5,377,195	9,318,425
Gross margin	936,680	1,634,251	2,577,840	5,336,492
Engineering, research, and development	546,691	615,007	1,691,631	1,783,655
Selling, general and administrative	225,610	256,599	861,795	946,589
Amortization of deferred financing costs	0	0	0	0
Change in fair value of common stock warrants	0	0	0	0
Interest expense, net	0	0	0	0
Total expenses	772,301	871,606	2,553,426	2,730,244
Income (loss) before income taxes	164,379	762,645	24,414	2,606,248
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	322,781	326,281	1,019,277	1,096,333
Litigation costs	134,765	282,490	560,610	609,330
Legal damages	30,523		2,130,523
Amortization of deferred financing costs	649	1,359	3,363	4,072
Change in fair value of common stock warrants	(5,000)	(37,000)	(95,000)	(288,203)
Proceeds from life insurance	0		(92,678)
Interest expense, net	14,097	11,620	38,435	46,953
Total expenses	497,815	584,750	3,564,530	1,468,485
Income (loss) before income taxes	$ (497,815)	$ (584,750)	$ (3,564,530)	$ (1,468,485)