Consolidated Statements of Equity - USD ($)		Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Mar. 31, 2016		2,372,527
Balance at Mar. 31, 2016		$ 593,131	$ 4,956,171	$ 28,821,825	$ (140,519)	$ 1,040,922	$ 35,271,530
Repurchase of common stock (in shares)		(329,738)
Repurchase of common stock		$ (82,435)	(687,635)	(7,146,939)			(7,917,009)
Net loss*	[1]			(3,213,539)		(1,862,047)	(5,075,586)
Net change from marketable securities, net of tax					256,139		256,139
Foreign currency translation income (loss)					(327,667)	17,987	(309,680)
Stock-based compensation			(63,000)				$ (63,000)
Exercise of stock options (in shares)							0
Balance (in shares) at Mar. 31, 2017		2,042,789
Balance at Mar. 31, 2017		$ 510,696	4,205,536	18,461,347	(212,047)	(803,138)	$ 22,162,394
Net loss*	[2]			2,277,109		(75,440)	2,201,669
Net change from marketable securities, net of tax			(317,132)				(317,132)
Foreign currency translation income (loss)					225,804	3,811	$ 229,615
Exercise of stock options (in shares)		818					818
Exercise of stock options		$ 205	8,433				$ 8,638
Redeemable non-controlling interest			(42,100)				(42,100)
Reclassification due to the Tax Cuts and Jobs Act				(42,475)	42,475
Balance (in shares) at Mar. 31, 2018		2,043,607
Balance at Mar. 31, 2018		$ 510,901	$ 4,171,869	$ 20,695,981	$ (260,900)	$ (874,767)	$ 24,243,084

[1] Excludes amount attributable to redeemable non-controlling interest in Contrail Aviation $131,400

[2] Excludes amount attributable to redeemable non-controlling interest in Contrail Aviation $254,938