Note 10 - Segment Information (Details) - Schedule of Segment Reporting Information, by Segment - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 3,975,736	$ 2,625,793	$ 8,012,891	$ 7,955,035
Cost of sales	2,006,132	1,689,113	4,562,761	5,377,195
Gross margin	1,969,604	936,680	3,450,130	2,577,840
Engineering, research, and development	622,082	546,691	1,642,785	1,691,631
Selling, general and administrative	530,180	548,391	1,652,116	1,881,072
Litigation costs	59,680	134,765	134,799	560,610
Legal damages		30,523		2,130,523
Amortization of deferred financing costs	0	649	0	3,363
Change in fair value of common stock warrants	23,000	(5,000)	23,000	(95,000)
Proceeds from life insurance	0	0	0	(92,678)
Interest income	(1,010)	0	(3,017)	0
Interest expense - judgment	72,003	30,523	215,226	30,523
Interest expense, net	24,216	14,097	83,251	38,435
Total expenses	1,330,151	1,270,116	3,748,160	6,117,956
Income (loss) before income taxes	639,453	(333,436)	(298,030)	(3,540,116)
Avionics Government [Member]
Segment Reporting Information [Line Items]
Net sales	3,484,380	1,825,744	5,861,061	5,826,763
Cost of sales	1,735,573	1,013,481	3,211,417	3,489,223
Gross margin	1,748,807	812,263	2,649,644	2,337,540
Avionics Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	491,356	800,049	2,151,830	2,128,272
Cost of sales	270,559	675,632	1,351,344	1,887,972
Gross margin	220,797	124,417	800,486	240,300
Avionics Total [Member]
Segment Reporting Information [Line Items]
Net sales	3,975,736	2,625,793	8,012,891	7,955,035
Cost of sales	2,006,132	1,689,113	4,562,761	5,377,195
Gross margin	1,969,604	936,680	3,450,130	2,577,840
Engineering, research, and development	622,082	546,691	1,642,785	1,691,631
Selling, general and administrative	228,107	225,610	639,414	861,795
Amortization of deferred financing costs		0		0
Change in fair value of common stock warrants		0	0	0
Interest income	0		0
Interest expense, net	0	0	0	0
Total expenses	850,189	772,301	2,282,199	2,553,426
Income (loss) before income taxes	1,119,415	164,379	1,167,931	24,414
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	302,073	322,781	1,012,702	1,019,277
Litigation costs	59,680	134,765	134,799	560,610
Legal damages		30,523		2,130,523
Amortization of deferred financing costs		649		3,363
Change in fair value of common stock warrants	23,000	(5,000)	23,000	(95,000)
Proceeds from life insurance		0		(92,678)
Interest income	(1,010)		(3,017)
Interest expense - judgment	72,003		215,226
Interest expense, net	24,216	14,097	83,251	38,435
Total expenses	479,962	497,815	1,465,961	3,564,530
Income (loss) before income taxes	$ (479,962)	$ (497,815)	$ (1,465,961)	$ (3,564,530)