Condensed Consolidated Statements of Equity (Unaudited) - 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, 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 income*	[1]			968,389		18,239	986,628
Net change from marketable securities, net of tax					(94,997)		(94,997)
Foreign currency translation gain					135,634	(845)	134,789
Redeemable non-controlling interest			(25,000)				(25,000)
Balance (in shares) at Jun. 30, 2017		2,042,789
Balance at Jun. 30, 2017		$ 510,696	4,180,536	19,429,736	(171,410)	(785,744)	23,163,814
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	[2]
Net income*	[1]			2,828,694		(46,259)	2,782,435
Foreign currency translation gain					30,508	17,152	47,660
Adoption of ASU 2016-01 | Accounting Standards Update 2016-01 [Member]				(106,341)	106,341
Balance (in shares) at Jun. 30, 2018		2,043,607
Balance at Jun. 30, 2018		$ 510,901	$ 4,171,869	$ 23,418,334	$ (124,051)	$ (903,874)	$ 27,073,179

[1] Excludes amount attributable to redeemable non-controlling interest in Contrail Aviation.

[2] Derived from audited consolidated financial statements