Condensed Consolidated Statements of Equity (Unaudited) - USD ($)		Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interests
Balance (in shares) at Mar. 31, 2018			2,044,000
Balance at Mar. 31, 2018		$ 24,243,000	$ 511,000	$ 4,172,000	$ 20,696,000	$ (261,000)	$ (875,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)*	[1]	2,782,000			2,829,000		(46,000)
Reclassification of unrealized loss on marketable securities, net of tax		0			(106,000)	106,000
Foreign currency translation gain		48,000				31,000	17,000
Balance (in shares) at Jun. 30, 2018			2,044,000
Balance at Jun. 30, 2018		27,073,000	$ 511,000	4,172,000	23,418,000	(124,000)	(904,000)
Balance (in shares) at Mar. 31, 2018			2,044,000
Balance at Mar. 31, 2018		24,243,000	$ 511,000	4,172,000	20,696,000	(261,000)	(875,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation gain		79,000
Issuance of Warrants		0
Unrealized loss on interest rate swaps, net of tax		29,000
Balance (in shares) at Sep. 30, 2018			2,045,000
Balance at Sep. 30, 2018		25,766,000	$ 511,000	4,188,000	22,076,000	(71,000)	(938,000)
Balance (in shares) at Jun. 30, 2018			2,044,000
Balance at Jun. 30, 2018		27,073,000	$ 511,000	4,172,000	23,418,000	(124,000)	(904,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)*	[1]	(1,363,000)			(1,321,000)		(42,000)
Foreign currency translation gain		32,000				24,000	8,000
Exercises of stock options (in shares)			2,000
Exercise of stock options		18,000		18,000
Repurchase of common stock (in shares)			(1,000)
Repurchase of common stock		(23,000)	$ 0	(2,000)	(21,000)	0
Unrealized loss on interest rate swaps, net of tax		29,000				29,000
Balance (in shares) at Sep. 30, 2018			2,045,000
Balance at Sep. 30, 2018		25,766,000	$ 511,000	4,188,000	22,076,000	(71,000)	(938,000)
Balance (in shares) at Mar. 31, 2019			2,022,000
Balance at Mar. 31, 2019		23,358,000	$ 506,000	2,866,000	21,191,000	(205,000)	(1,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)*	[1]	3,816,000			1,782,000		2,034,000
Foreign currency translation gain		(18,000)				(30,000)	12,000
Repurchase of common stock (in shares)			(17,000)
Repurchase of common stock		(126,000)	$ (4,000)		(122,000)	0
Stock Split (in shares)			1,010,000
Stock Split			$ 252,000	(252,000)
Issuance of Debt - Trust Preferred Securities		(4,000,000)			(4,000,000)
Issuance of Warrants		(840,000)			(840,000)
Unrealized loss on interest rate swaps, net of tax		(176,000)				(176,000)
Adjustment to fair value of redeemable non-controlling interest		(985,000)		(985,000)
Balance (in shares) at Jun. 30, 2019			3,015,000
Balance at Jun. 30, 2019		20,988,000	$ 754,000	1,629,000	17,970,000	(411,000)	1,046,000
Balance (in shares) at Mar. 31, 2019			2,022,000
Balance at Mar. 31, 2019		23,358,000	$ 506,000	2,866,000	21,191,000	(205,000)	(1,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation gain		23,000
Issuance of Warrants		(840,000)
Unrealized loss on interest rate swaps, net of tax		(264,000)
Adjustment to fair value of redeemable non-controlling interest		203,858
Balance (in shares) at Sep. 30, 2019			3,023,000
Balance at Sep. 30, 2019		27,347,000	$ 756,000	2,410,000	23,610,000	(461,000)	1,032,000
Balance (in shares) at Jun. 30, 2019			3,015,000
Balance at Jun. 30, 2019		20,988,000	$ 754,000	1,629,000	17,970,000	(411,000)	1,046,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)*	[1]	5,698,000			5,715,000		(17,000)
Foreign currency translation gain		41,000				38,000	3,000
Repurchase of common stock (in shares)			8,000
Repurchase of common stock		(73,000)	$ 2,000		(75,000)	0
Unrealized loss on interest rate swaps, net of tax		(88,000)				(88,000)
Adjustment to fair value of redeemable non-controlling interest		781,000		781,000
Balance (in shares) at Sep. 30, 2019			3,023,000
Balance at Sep. 30, 2019		$ 27,347,000	$ 756,000	$ 2,410,000	$ 23,610,000	$ (461,000)	$ 1,032,000

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