Condensed Consolidated Statements of Equity - 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 at Mar. 31, 2020		$ 25,011		$ 756	$ (2,617)	$ 2,636	$ 23,768		$ (537)	$ 1,005
Balance (in shares) at Mar. 31, 2020				3,023	141
Increase (Decrease) in Stockholders' Equity
Net income (loss)	[1]	(846)					(841)			(5)
Unrealized gain (loss) on interest rate swaps, net of tax		(26)							(26)
Foreign currency translation loss		(67)							(67)
Adjustment to fair value of redeemable non-controlling interests		429				429
Balance at Jun. 30, 2020		24,501		$ 756	$ (2,617)	3,065	22,927		(630)	1,000
Balance (in shares) at Jun. 30, 2020				3,023	141
Balance at Mar. 31, 2020		25,011		$ 756	$ (2,617)	2,636	23,768		(537)	1,005
Balance (in shares) at Mar. 31, 2020				3,023	141
Increase (Decrease) in Stockholders' Equity
Unrealized gain (loss) on interest rate swaps, net of tax		100
Foreign currency translation loss		(157)
Balance at Dec. 31, 2020		21,928		$ 756	$ (2,617)	1,287	22,105		(594)	991
Balance (in shares) at Dec. 31, 2020				3,023	141
Balance at Jun. 30, 2020		24,501		$ 756	$ (2,617)	3,065	22,927		(630)	1,000
Balance (in shares) at Jun. 30, 2020				3,023	141
Increase (Decrease) in Stockholders' Equity
Net income (loss)	[1]	(2,928)					(2,920)			(8)
Unrealized gain (loss) on interest rate swaps, net of tax		55							55
Foreign currency translation loss		(68)							(68)
Adjustment to fair value of redeemable non-controlling interests		(890)				(890)
Balance at Sep. 30, 2020		20,670		$ 756	$ (2,617)	2,175	20,007		(643)	992
Balance (in shares) at Sep. 30, 2020				3,023	141
Increase (Decrease) in Stockholders' Equity
Net income (loss)		2,097					2,098			(1)
Unrealized gain (loss) on interest rate swaps, net of tax		71							71
Foreign currency translation loss		(22)							(22)
Adjustment to fair value of redeemable non-controlling interests		(888)				(888)
Balance at Dec. 31, 2020		21,928		$ 756	$ (2,617)	1,287	22,105		(594)	991
Balance (in shares) at Dec. 31, 2020				3,023	141
Balance at Mar. 31, 2021		14,714		$ 756	$ (2,617)	0	16,270		(684)	989
Balance (in shares) at Mar. 31, 2021				3,023	141
Increase (Decrease) in Stockholders' Equity
Net income (loss)	[1]	442					289			153
Unrealized gain (loss) on interest rate swaps, net of tax		11							11
Foreign currency translation loss		(49)							(49)
Adjustment to fair value of redeemable non-controlling interests		(238)					(238)
Reclassification of interest rate swaps into earnings		(1)							(1)
Balance at Jun. 30, 2021		14,879		$ 756	$ (2,617)	0	16,321		(723)	1,142
Balance (in shares) at Jun. 30, 2021				3,023	141
Balance at Mar. 31, 2021		14,714		$ 756	$ (2,617)	0	16,270		(684)	989
Balance (in shares) at Mar. 31, 2021				3,023	141
Increase (Decrease) in Stockholders' Equity
Unrealized gain (loss) on interest rate swaps, net of tax		37
Foreign currency translation loss		73
Balance at Dec. 31, 2021		21,295		$ 756	$ (2,617)	315	22,283		(555)	1,113
Balance (in shares) at Dec. 31, 2021				3,023	141
Balance at Jun. 30, 2021		14,879		$ 756	$ (2,617)	0	16,321		(723)	1,142
Balance (in shares) at Jun. 30, 2021				3,023	141
Increase (Decrease) in Stockholders' Equity
Net income (loss)		7,543	[1]				7,555	[1]		(12)
Stock compensation expense		236				236
Unrealized gain (loss) on interest rate swaps, net of tax		46							46
Foreign currency translation loss		103							103
Adjustment to fair value of redeemable non-controlling interests		183					183
Reclassification of interest rate swaps into earnings		(2)							(2)
Balance at Sep. 30, 2021		22,988		$ 756	$ (2,617)	236	24,059		(576)	1,130
Balance (in shares) at Sep. 30, 2021				3,023	141
Increase (Decrease) in Stockholders' Equity
Net income (loss)		(1,279)					(1,262)			(17)
Stock compensation expense		79				79
Unrealized gain (loss) on interest rate swaps, net of tax		(20)							(20)
Foreign currency translation loss		19							19
Adjustment to fair value of redeemable non-controlling interests		(514)					(514)
Reclassification of interest rate swaps into earnings		22							22
Balance at Dec. 31, 2021		$ 21,295		$ 756	$ (2,617)	$ 315	$ 22,283		$ (555)	$ 1,113
Balance (in shares) at Dec. 31, 2021				3,023	141

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