Condensed Consolidated Statements of Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands		Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interests
Balance (in shares) at Mar. 31, 2018			2,044
Balance at Mar. 31, 2018		$ 24,243	$ 511		$ 4,172	$ 20,696	$ (261)	$ (875)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)*	[1]	2,783				2,829		(46)
Foreign currency translation gain		48					31	17
Reclassification of unrealized loss on marketable securities, net of tax						(106)	106
Balance (in shares) at Jun. 30, 2018			2,044
Balance at Jun. 30, 2018		27,074	$ 511		4,172	23,419	(124)	(904)
Balance (in shares) at Mar. 31, 2018			2,044
Balance at Mar. 31, 2018		24,243	$ 511		4,172	20,696	(261)	(875)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Unrealized loss on interest rate swaps, net of tax		(134)
Foreign currency translation gain		201
Balance (in shares) at Dec. 31, 2018			2,025
Balance at Dec. 31, 2018		22,318	$ 506		4,195	18,695	(120)	(958)
Balance (in shares) at Jun. 30, 2018			2,044
Balance at Jun. 30, 2018		27,074	$ 511		4,172	23,419	(124)	(904)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)*	[1]	(1,363)				(1,321)		(42)
Repurchase of common stock (in shares)			(1)
Repurchase of common stock		(23)			(2)	(21)
Unrealized loss on interest rate swaps, net of tax		29					29
Foreign currency translation gain		32					24	8
Exercises of stock options (in shares)			2
Exercise of stock options		18			18
Balance (in shares) at Sep. 30, 2018			2,045
Balance at Sep. 30, 2018		25,767	$ 511		4,188	22,077	(71)	(938)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)*		(2,742)				(2,715)		(27)
Repurchase of common stock (in shares)			(20)
Repurchase of common stock		(671)	$ (5)		1	(667)
Unrealized loss on interest rate swaps, net of tax		(163)					(163)
Foreign currency translation gain		121					114	7
Equity-based compensation		6			6
Balance (in shares) at Dec. 31, 2018			2,025
Balance at Dec. 31, 2018		22,318	$ 506		4,195	18,695	(120)	(958)
Balance (in shares) at Mar. 31, 2019			2,022
Balance at Mar. 31, 2019		23,358	$ 506		2,866	21,191	(205)	(1,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)*	[1]	3,816				1,782		2,034
Repurchase of common stock (in shares)			(17)
Repurchase of common stock		(126)	$ (4)			(122)
Stock Split			(1,010)
Stock Split			$ 252		(252)
Issuance of Debt - Trust Preferred Securities		(4,000)				(4,000)
Issuance of Warrants		(840)				(840)
Unrealized loss on interest rate swaps, net of tax		(176)					(176)
Foreign currency translation gain		(18)					(30)	12
Adjustment to fair value of redeemable non-controlling interest		(985)			(985)
Balance (in shares) at Jun. 30, 2019			3,015
Balance at Jun. 30, 2019		20,988	$ 754		1,629	17,970	(411)	1,046
Balance (in shares) at Mar. 31, 2019			2,022
Balance at Mar. 31, 2019		23,358	$ 506		2,866	21,191	(205)	(1,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Unrealized loss on interest rate swaps, net of tax		(170)
Foreign currency translation gain		(29)
Adjustment to fair value of redeemable non-controlling interest		(1,585)
Balance (in shares) at Dec. 31, 2019			3,023	110
Balance at Dec. 31, 2019		23,401	$ 756	$ (2,157)	1,029	23,180	(420)	1,013
Balance (in shares) at Jun. 30, 2019			3,015
Balance at Jun. 30, 2019		20,988	$ 754		1,629	17,970	(411)	1,046
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)*	[1]	5,698				5,715		(17)
Repurchase of common stock (in shares)			8
Repurchase of common stock		(73)	$ 2			(75)
Unrealized loss on interest rate swaps, net of tax		(88)					(88)
Foreign currency translation gain		41					38	3
Adjustment to fair value of redeemable non-controlling interest		781			781
Balance (in shares) at Sep. 30, 2019			3,023
Balance at Sep. 30, 2019		27,347	$ 756		2,410	23,610	(461)	1,032
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)*	[1]	(449)				(430)		(19)
Repurchase of common stock (in shares)				110
Repurchase of common stock		(2,157)		$ (2,157)
Unrealized loss on interest rate swaps, net of tax		94					94
Foreign currency translation gain		(53)					(53)
Adjustment to fair value of redeemable non-controlling interest		(1,381)			(1,381)
Balance (in shares) at Dec. 31, 2019			3,023	110
Balance at Dec. 31, 2019		$ 23,401	$ 756	$ (2,157)	$ 1,029	$ 23,180	$ (420)	$ 1,013

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