Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Noncontrolling Interest
Beginning balance at Dec. 31, 2019	$ 169,862	$ 111	$ 49,204	$ 157,525	$ (16,795)	$ (20,183)	$ 0
Increase (Decrease) in Stockholders' Equity
Net income (loss)	5,487			5,487
Other comprehensive income, net of tax:
Pension liability adjustment	200					200
Foreign currency translation adjustment	(1,708)					(1,708)
Unrealized derivative loss on cash flow hedges	(809)					(809)
Cash flow hedges reclassified to earnings	137					137
Issuance of common shares, net of share withheld for taxes	(1,660)		(5,733)		4,073
Stock-based compensation	1,842		1,842
Ending balance at Sep. 30, 2020	173,351	111	45,313	163,012	(12,722)	(22,363)	0
Beginning balance at Jun. 30, 2020	163,896	111	44,709	156,182	(12,722)	(24,384)	0
Increase (Decrease) in Stockholders' Equity
Net income (loss)	6,830			6,830
Other comprehensive income, net of tax:
Pension liability adjustment	66					66
Foreign currency translation adjustment	1,818					1,818
Unrealized derivative loss on cash flow hedges	0
Cash flow hedges reclassified to earnings	137					137
Stock-based compensation	604		604
Ending balance at Sep. 30, 2020	173,351	111	45,313	163,012	(12,722)	(22,363)	0
Beginning balance at Dec. 31, 2020	176,830	111	44,583	165,107	(12,703)	(20,268)	0
Increase (Decrease) in Stockholders' Equity
Net income (loss)	3,896			3,960			(64)
Other comprehensive income, net of tax:
Pension liability adjustment	274					274
Foreign currency translation adjustment	(649)					(639)	(10)
Unrealized derivative loss on cash flow hedges	(33)					(33)
Cash flow hedges reclassified to earnings	409					409
Issuance of common shares, net of share withheld for taxes	(549)		(2,335)		1,786
Stock-based compensation	1,800		1,800
Investment of noncontrolling interest	396						396
Ending balance at Sep. 30, 2021	182,374	111	44,048	169,067	(10,917)	(20,257)	322
Beginning balance at Jun. 30, 2021	180,892	111	43,650	166,725	(11,104)	(18,873)	383
Increase (Decrease) in Stockholders' Equity
Net income (loss)	2,312			2,342			(30)
Other comprehensive income, net of tax:
Pension liability adjustment	92					92
Foreign currency translation adjustment	(1,610)					(1,579)	(31)
Unrealized derivative loss on cash flow hedges	(33)					(33)
Cash flow hedges reclassified to earnings	136					136
Issuance of common shares, net of share withheld for taxes	(2)		(189)		187
Stock-based compensation	587		587
Ending balance at Sep. 30, 2021	$ 182,374	$ 111	$ 44,048	$ 169,067	$ (10,917)	$ (20,257)	$ 322