Note 9 - Segment Information (Details) - Schedule of Segment Reporting Information, by Segment - USD ($)	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Net sales	$ 3,306,462	$ 1,814,214
Cost of Sales	1,724,858	1,332,901
Gross Margin	1,581,604	481,313
Engineering, research, and Development	525,103	517,323
Selling, general, and administrative	612,471	566,525
Litigation expenses	10,507	39,271
Change in fair value of common stock warrant	78,500	0
Interest income	(1,000)	(998)
Interest expense - judgment	80,510	71,220
Interest expense, net	17,737	34,045
Total expenses	1,323,828	1,227,386
Income (loss) before income taxes	257,776	(746,073)
Avionics Government [Member]
Segment Reporting Information [Line Items]
Net sales	2,504,140	1,092,582
Cost of Sales	1,242,567	761,254
Gross Margin	1,261,573	331,328
Avionics Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	802,322	721,632
Cost of Sales	482,291	571,647
Gross Margin	320,031	149,985
Avionics Total [Member]
Segment Reporting Information [Line Items]
Net sales	3,306,462	1,814,214
Cost of Sales	1,724,858	1,332,901
Gross Margin	1,581,604	481,313
Engineering, research, and Development	525,103	517,323
Selling, general, and administrative	234,578	217,128
Litigation expenses	0	0
Change in fair value of common stock warrant	0
Interest income	0	0
Interest expense - judgment	0
Interest expense, net	0	0
Total expenses	759,681	734,451
Income (loss) before income taxes	821,923	(253,138)
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Net sales	0	0
Cost of Sales	0	0
Gross Margin	0	0
Engineering, research, and Development	0	0
Selling, general, and administrative	377,893	349,397
Litigation expenses	10,507	39,271
Change in fair value of common stock warrant	78,500
Interest income	(1,000)	(998)
Interest expense - judgment	80,510	71,220
Interest expense, net	17,737	34,045
Total expenses	564,147	492,935
Income (loss) before income taxes	$ (564,147)	$ (492,935)