CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Equity Offering	ATM Offering	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Common Stock Equity Offering	Common Stock ATM Offering	Additional Paid-In Capital	Additional Paid-In Capital Equity Offering	Additional Paid-In Capital ATM Offering	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Other Cumulative Comprehensive Loss	Treasury Stock and Company Stock Held for Deferred Compensation
Beginning balances (in shares) at Dec. 31, 2019					15,117,207									464,532
Beginning balances at Dec. 31, 2019	$ 172,141			$ (50)	$ 756			$ 85,639			$ 119,002	$ (50)	$ (25,803)	$ (7,453)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(1,493)										(1,493)
Change in cumulative foreign currency translation adjustment	(235)												(235)
Shares issued in connection with stock compensation plans (in shares)					180,084
Shares issued in connection with stock compensation plans	263				$ 9			254
Stock-based compensation	2,608							2,608
Dividends declared	(1,883)										(1,883)
Treasury stock activity (in shares)														(63,449)
Treasury stock activity	(1,068)													$ (1,068)
Ending balances (in shares) at Jun. 30, 2020					15,297,291									527,981
Ending balances at Jun. 30, 2020	170,283				$ 765			88,501			115,576		(26,038)	$ (8,521)
Beginning balances (in shares) at Mar. 31, 2020					15,260,835									509,593
Beginning balances at Mar. 31, 2020	173,689				$ 763			86,832			121,224		(26,643)	$ (8,487)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(5,648)										(5,648)
Change in cumulative foreign currency translation adjustment	605												605
Shares issued in connection with stock compensation plans (in shares)					36,456
Shares issued in connection with stock compensation plans	263				$ 2			261
Stock-based compensation	1,408							1,408
Treasury stock activity (in shares)														(18,388)
Treasury stock activity	(34)													$ (34)
Ending balances (in shares) at Jun. 30, 2020					15,297,291									527,981
Ending balances at Jun. 30, 2020	170,283				$ 765			88,501			115,576		(26,038)	$ (8,521)
Beginning balances (in shares) at Dec. 31, 2020					15,917,559									528,274
Beginning balances at Dec. 31, 2020	196,914				$ 796			117,387			115,657		(22,962)	$ (13,964)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	2,156										2,156
Change in cumulative foreign currency translation adjustment	(1,494)												(1,494)
Shares issued in connection with public offering (in shares)						2,875,000	397,820
Shares issued in connection with public offering		$ 123,461	$ 25,262			$ 144	$ 20		$ 123,317	$ 25,242
Shares issued in connection with stock compensation plans (in shares)					104,366
Shares issued in connection with stock compensation plans	253				$ 5			248
Stock-based compensation	3,181							3,181
Treasury stock activity (in shares)														(41,463)
Treasury stock activity	(3,696)													$ (3,696)
Ending balances (in shares) at Jun. 30, 2021					19,294,745									569,737
Ending balances at Jun. 30, 2021	346,037				$ 965			269,375			117,813		(24,456)	$ (17,660)
Beginning balances (in shares) at Mar. 31, 2021					16,399,813									566,343
Beginning balances at Mar. 31, 2021	218,430				$ 820			144,094			116,089		(24,929)	$ (17,644)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	1,724										1,724
Change in cumulative foreign currency translation adjustment	473												473
Shares issued in connection with public offering (in shares)						2,875,000
Shares issued in connection with public offering		$ 123,461				$ 144			$ 123,317
Shares issued in connection with stock compensation plans (in shares)					19,932
Shares issued in connection with stock compensation plans	253				$ 1			252
Stock-based compensation	1,712							1,712
Treasury stock activity (in shares)														(3,394)
Treasury stock activity	(16)													$ (16)
Ending balances (in shares) at Jun. 30, 2021					19,294,745									569,737
Ending balances at Jun. 30, 2021	$ 346,037				$ 965			$ 269,375			$ 117,813		$ (24,456)	$ (17,660)