Note 10 - Segment Information (Details) - Schedule of Segment Reporting Information, by Segment - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Net sales	$ 2,222,941	$ 1,787,165	$ 4,037,155	$ 5,329,242
Cost of sales	1,223,728	1,387,295	2,556,629	3,688,082
Gross margin	999,213	399,870	1,480,526	1,641,160
Engineering, research, and development	503,380	529,667	1,020,703	1,144,940
Selling, general and administrative	555,411	626,395	1,121,936	1,332,681
Litigation costs	35,848	43,333	75,119	425,845
Legal damages		2,100,000		2,100,000
Amortization of deferred financing costs	0	1,357	0	2,714
Change in fair value of common stock warrants	0	5,000	0	(90,000)
Proceeds from life insurance	0	0	0	(92,678)
Interest income	(1,009)	0	(2,007)	0
Interest expense - judgment	72,003	0	143,223	0
Interest expense, net	24,990	14,707	59,035	24,338
Total expenses	1,190,623	3,320,459	2,418,009	4,847,840
Income (loss) before income taxes	(191,410)	(2,920,589)	(937,483)	(3,206,680)
Avionics Government [Member]
Segment Reporting Information [Line Items]
Net sales	1,284,099	1,028,693	2,376,681	4,001,019
Cost of sales	714,590	660,589	1,475,844	2,475,742
Gross margin	569,509	368,104	900,837	1,525,277
Avionics Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	938,842	758,472	1,660,474	1,328,223
Cost of sales	509,138	726,706	1,080,785	1,212,340
Gross margin	429,704	31,766	579,689	115,883
Avionics Total [Member]
Segment Reporting Information [Line Items]
Net sales	2,222,941	1,787,165	4,037,155	5,329,242
Cost of sales	1,223,728	1,387,295	2,556,629	3,688,082
Gross margin	999,213	399,870	1,480,526	1,641,160
Engineering, research, and development	503,380	529,667	1,020,703	1,144,940
Selling, general and administrative	194,179	277,518	411,307	636,185
Amortization of deferred financing costs		0		0
Change in fair value of common stock warrants		0		0
Interest income	0		0
Interest expense, net	0	0	0	0
Total expenses	697,559	807,185	1,432,010	1,781,125
Income (loss) before income taxes	301,654	(407,315)	48,516	(139,965)
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	361,232	348,877	710,629	696,496
Litigation costs	35,848	43,333	75,119	425,845
Legal damages		2,100,000		2,100,000
Amortization of deferred financing costs		1,357		2,714
Change in fair value of common stock warrants		5,000		(90,000)
Proceeds from life insurance		0		(92,678)
Interest income	(1,009)		(2,007)
Interest expense - judgment	72,003		143,223
Interest expense, net	24,990	14,707	59,035	24,338
Total expenses	493,064	2,513,274	985,999	3,066,715
Income (loss) before income taxes	$ (493,064)	$ (2,513,274)	$ (985,999)	$ (3,066,715)