UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Total
Beginning balance, shares at Dec. 31, 2017	21,489,000
Beginning balance, value at Dec. 31, 2017	$ 71,582	$ 119,537	$ (7,182)
Common stock issued upon exercise of options and warrants, shares	313,000
Common stock issued upon exercise of options and warrants, value	$ 480
Repurchase of common stock, shares	(839,000)
Repurchase of common stock, value	$ (3,260)
Stock-based compensation	$ 2,153
Pension benefit obligation				$ 0
Net income		6,312		6,312
Ending balance, shares at Jun. 30, 2018	20,963,000
Ending balance, value at Jun. 30, 2018	$ 70,955	125,849	(7,182)	189,622
Beginning balance, shares at Mar. 31, 2018	21,442,000
Beginning balance, value at Mar. 31, 2018	$ 71,824	122,684	(7,182)
Common stock issued upon exercise of options and warrants, shares	5,000
Common stock issued upon exercise of options and warrants, value	$ 5
Repurchase of common stock, shares	(484,000)
Repurchase of common stock, value	$ (1,841)
Stock-based compensation	$ 967
Pension benefit obligation				0
Net income		3,165		3,165
Ending balance, shares at Jun. 30, 2018	20,963,000
Ending balance, value at Jun. 30, 2018	$ 70,955	125,849	(7,182)	189,622
Beginning balance, shares at Dec. 31, 2018	22,422,000
Beginning balance, value at Dec. 31, 2018	$ 70,273	134,399	(7,554)	197,118
Common stock issued upon exercise of options and warrants, shares	483,000
Common stock issued upon exercise of options and warrants, value	$ 347
Repurchase of common stock, shares	(379,000)
Repurchase of common stock, value	$ (1,440)
Stock-based compensation	$ 1,119
Pension benefit obligation				0
Net income		3,539		3,539
Ending balance, shares at Jun. 30, 2019	22,526,000
Ending balance, value at Jun. 30, 2019	$ 70,299	137,938	(7,554)	200,683
Beginning balance, shares at Mar. 31, 2019	22,134,000
Beginning balance, value at Mar. 31, 2019	$ 69,544	136,138	(7,554)
Common stock issued upon exercise of options and warrants, shares	405,000
Common stock issued upon exercise of options and warrants, value	$ 274
Repurchase of common stock, shares	(13,000)
Repurchase of common stock, value
Stock-based compensation	$ 481
Pension benefit obligation				0
Net income		1,800		1,800
Ending balance, shares at Jun. 30, 2019	22,526,000
Ending balance, value at Jun. 30, 2019	$ 70,299	$ 137,938	$ (7,554)	$ 200,683