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, 2016		2,372,527
Balance at Mar. 31, 2016		$ 593,131	$ 4,956,171	$ 28,821,825	$ (140,519)	$ 1,040,922	[1]	$ 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 income (Loss) *				(3,447,332)		(1,851,798)	[1]	(5,299,130)	[1]
Net change from marketable securities, net of tax					392,232			392,232
Foreign currency translation gain (loss)					(247,200)	(121,758)	[1]	(368,958)
Balance (in shares) at Dec. 31, 2016		2,042,789
Balance at Dec. 31, 2016		$ 510,696	4,268,536	18,227,554	4,513	(932,634)	[1]	22,078,665
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)	[1]	22,162,394	[2]
Net income (Loss) *	[1]			718,151		16,197		734,348
Net change from marketable securities, net of tax					35,961			35,961
Foreign currency translation gain (loss)					251,191	4,242	[1]	255,433
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 Dec. 31, 2017		2,042,789
Balance at Dec. 31, 2017		$ 510,696	$ 4,163,436	$ 19,137,023	$ 117,580	$ (782,699)	[1]	$ 23,146,036

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

[2] Derived from audited consolidated financial statements