Note 8 - Segment Information (Detail) - Schedule of segment reporting, by segment (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net sales	$ 2,394,950	$ 3,674,354	$ 3,572,238	$ 7,664,565
Cost of Sales	1,792,527	2,191,127	2,686,121	4,319,707
Gross Margin	602,423	1,483,227	886,117	3,344,858
Engineering, research, and development	548,800	677,933	1,127,404	1,526,971
Selling, general, and admin.	686,346	667,874	1,340,234	1,466,696
Amortization of debt discount	31,009	13,396	44,401	26,791
Amortization of debt expense	56,711	27,080	83,791	54,160
Financing costs	26,477	0	26,477	0
Change in fair value of common stock warrants	337	(104,891)	(249,057)	63,695
Proceeds from life insurance	0	0	0	(300,029)
Interest (income) expense, net	131,019	96,315	223,487	198,916
Total expenses	1,480,699	1,377,707	2,596,737	3,037,200
Income (loss) before income taxes	(878,276)	105,520	(1,710,620)	307,658
Avionics Gov't [Member]
Net sales	1,847,545	3,161,291	2,397,509	6,306,883
Cost of Sales	1,296,733	1,826,234	1,571,288	3,501,047
Gross Margin	550,812	1,335,057	826,221	2,805,836
Engineering, research, and development		0
Selling, general, and admin.	0	0
Amortization of debt discount	0	0
Amortization of debt expense	0	0
Change in fair value of common stock warrants	0	0
Proceeds from life insurance				0
Interest (income) expense, net	0	0
Total expenses	0	0
Income (loss) before income taxes		0	0
Avionics Comm'l. [Member]
Net sales	547,405	513,063	1,174,729	1,357,682
Cost of Sales	495,794	364,893	1,114,833	818,660
Gross Margin	51,611	148,170	59,896	539,022
Engineering, research, and development		0
Selling, general, and admin.	0	0
Amortization of debt discount	0	0
Amortization of debt expense	0	0
Change in fair value of common stock warrants	0	0
Proceeds from life insurance				0
Interest (income) expense, net	0	0
Total expenses	0	0
Income (loss) before income taxes		0	0
Avionics Total [Member]
Net sales	2,394,950	3,674,354	3,572,238	7,664,565
Cost of Sales	1,792,527	2,191,127	2,686,121	4,319,707
Gross Margin	602,423	1,483,227	886,117	3,344,858
Engineering, research, and development	548,800	677,933	1,127,404	1,526,971
Selling, general, and admin.	310,147	326,027	627,137	687,843
Amortization of debt discount	0	0		0
Amortization of debt expense	0	0		0
Change in fair value of common stock warrants	0	0		0
Proceeds from life insurance				0
Interest (income) expense, net		0		0
Total expenses	858,947	1,003,960	1,754,541	2,214,814
Income (loss) before income taxes	(256,524)	479,267	(868,424)	1,130,044
Corporate [Member]
Net sales	0	0	0	0
Cost of Sales	0	0	0	0
Gross Margin	0	0	0	0
Engineering, research, and development		0
Selling, general, and admin.	376,199	341,847	713,097	778,853
Amortization of debt discount	31,009	13,396	44,401	26,791
Amortization of debt expense	56,711	27,080	83,791	54,160
Financing costs	26,477		26,477
Change in fair value of common stock warrants	337	(104,891)	(249,057)	63,695
Proceeds from life insurance				(300,029)
Interest (income) expense, net	131,019	96,315	223,487	198,916
Total expenses	621,752	373,747	842,196	822,386
Income (loss) before income taxes	$ (621,752)	$ (373,747)	$ (842,196)	$ (822,386)