Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Shares [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Deficit [Member]
Beginning balance at Dec. 31, 2016	$ 93,033	$ 18,234	$ 202,033	$ (34,174)	$ (93,060)
Beginning balance, shares at Dec. 31, 2016		30,019,561
Stockholders' Equity [Roll Forward]
Net income (loss)	(9,889)	$ 0	0	0	(9,889)
Issuances under option plans	$ 4,396	$ 229	4,167	0	0
Issuances under option plans, shares	375,292	375,292
Dividend reinvestment plan	$ 131	$ 5	126	0	0
Dividend reinvestment plan, shares		7,625
Restricted stock vested	0	$ 79	(79)	0	0
Restricted stock vested, shares		130,036
Stock compensation expense	3,626	$ 0	3,626	0	0
Shares withheld for employee taxes on equity awards	(620)	$ 0	(620)	0	0
Shares withheld for employee taxes on equity awards, shares		(36,777)
Foreign currency translation adjustment	2,391	$ 0	0	2,391	0
Declared dividends	(16,558)	0	0	0	(16,558)
Pension liability, net of tax	41	0	0	41	0
Reclassification of foreign currency translation adjustment into net loss	17,201	0	0	17,201	0
Ending balance at Dec. 31, 2017	93,752	$ 18,547	209,253	(14,541)	(119,507)
Ending balance, shares at Dec. 31, 2017		30,495,737
Stockholders' Equity [Roll Forward]
Net income (loss)	(3,349)	$ 0	0	0	(3,349)
Issuances under option plans	$ 2,735	$ 117	2,618	0	0
Issuances under option plans, shares	191,169	191,169
Dividend reinvestment plan	$ 118	$ 4	114	0	0
Dividend reinvestment plan, shares		5,712
Restricted stock vested	0	$ 73	(73)	0	0
Restricted stock vested, shares		120,142
Stock compensation expense	4,644	$ 0	4,644	0	0
Shares withheld for employee taxes on equity awards	(714)	$ 0	(714)	0	0
Shares withheld for employee taxes on equity awards, shares		(38,639)
Foreign currency translation adjustment	(3,501)	$ 0	0	(3,501)	0
Declared dividends	(18,646)	0	0	0	(18,646)
Pension liability, net of tax	77	0	0	77	0
Shares issued in public offering, net of equity issuance costs	79,522	$ 2,806	76,716	0	0
Shares issued in public offering, net of equity issuance costs, shares		4,600,000
Ending balance at Dec. 31, 2018	$ 154,638	$ 21,547	292,558	(18,280)	(141,187)
Ending balance, shares at Dec. 31, 2018	35,374,121	35,374,121
Stockholders' Equity [Roll Forward]
Adoption of ASU | ASU 2018-02 [Member]	$ 0	$ 0	0	(315)	315
Net income (loss)	24,333	0	0	0	24,333
Issuances under option plans	$ 3,207	$ 146	3,061	0	0
Issuances under option plans, shares	221,695	240,499
Dividend reinvestment plan	$ 129	$ 5	124	0	0
Dividend reinvestment plan, shares		7,619
Restricted stock vested	0	$ 87	(87)	0	0
Restricted stock vested, shares		142,580
Stock compensation expense	1,715	$ 0	1,715	0	0
Shares withheld for employee taxes on equity awards	(1,008)	$ 0	(1,008)	0	0
Shares withheld for employee taxes on equity awards, shares		(53,885)
Foreign currency translation adjustment	1,649	$ 0	0	1,649	0
Declared dividends	(19,168)	0	0	0	(19,168)
Pension liability, net of tax	282	0	0	282	0
Ending balance at Dec. 31, 2019	$ 166,682	$ 21,785	296,363	(16,349)	(135,117)
Ending balance, shares at Dec. 31, 2019	35,710,934	35,710,934
Stockholders' Equity [Roll Forward]
Adoption of ASU | ASU 2016-02 [Member]	$ 905	$ 0	$ 0	$ 0	$ 905