Note 10 - Segment Information (Details) - Schedule of Segment Reporting Information, by Segment - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Net sales	$ 1,787,165	$ 5,076,029	$ 5,329,242	$ 10,418,398
Cost of sales	1,387,295	3,250,441	3,688,082	6,716,157
Gross margin	399,870	1,825,588	1,641,160	3,702,241
Engineering, research, and development	529,667	583,771	1,144,940	1,168,648
Selling, general and administrative	626,395	687,013	1,332,681	1,460,042
Litigation costs	43,333	188,125	425,845	326,840
Legal damages	2,100,000	0	2,100,000	0
Amortization of deferred financing costs	1,357	1,357	2,714	2,713
Change in fair value of common stock warrants	5,000	(34,000)	(90,000)	(251,203)
Proceeds from life insurance	0	0	(92,678)	0
Interest expense, net	14,707	17,507	24,338	35,333
Total expenses	3,320,459	1,443,773	4,847,840	2,742,373
Income (loss) before income taxes	(2,920,589)	381,815	(3,206,680)	959,868
Avionics Government [Member]
Segment Reporting Information [Line Items]
Net sales	1,028,693	4,338,764	4,001,019	9,210,384
Cost of sales	660,589	2,665,561	2,475,742	5,770,479
Gross margin	368,104	1,673,203	1,525,277	3,439,905
Avionics Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	758,472	737,265	1,328,223	1,208,014
Cost of sales	726,706	584,880	1,212,340	945,678
Gross margin	31,766	152,385	115,883	262,336
Avionics Total [Member]
Segment Reporting Information [Line Items]
Net sales	1,787,165	5,076,029	5,329,242	10,418,398
Cost of sales	1,387,295	3,250,441	3,688,082	6,716,157
Gross margin	399,870	1,825,588	1,641,160	3,702,241
Engineering, research, and development	529,667	583,771	1,144,940	1,168,648
Selling, general and administrative	277,518	346,108	636,185	689,990
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	807,185	929,879	1,781,125	1,858,638
Income (loss) before income taxes	(407,315)	895,709	(139,965)	1,843,603
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	348,877	340,905	696,496	770,052
Litigation costs	43,333	188,125	425,845	326,840
Legal damages	2,100,000		2,100,000
Amortization of deferred financing costs	1,357	1,357	2,714	2,713
Change in fair value of common stock warrants	5,000	(34,000)	(90,000)	(251,203)
Proceeds from life insurance	0		(92,678)
Interest expense, net	14,707	17,507	24,338	35,333
Total expenses	2,513,274	513,894	3,066,715	883,735
Income (loss) before income taxes	$ (2,513,274)	$ (513,894)	$ (3,066,715)	$ (883,735)