Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
Balances at Dec. 31, 2020	$ 31	$ 171,785	$ (61,375)	$ (2,399)	$ (43,727)	$ 64,315
Purchase of shares treasury stock					(1,210)	(1,210)
Non-cash stock compensation expense		(54)				(54)
Other comprehensive income (loss), foreign currency translation adjustment				56		56
Net income			9,232			9,232
Issuance of 23,581 common shares for the exercise of stock options		911				911
Balances at Mar. 31, 2021	31	172,642	(52,143)	(2,343)	(44,937)	73,250
Balances at Dec. 31, 2020	31	171,785	(61,375)	(2,399)	(43,727)	64,315
Other comprehensive income (loss), foreign currency translation adjustment						22
Net income						27,833
Balances at Sep. 30, 2021	31	173,112	(42,701)	(2,377)	(44,937)	83,128
Balances at Mar. 31, 2021	31	172,642	(52,143)	(2,343)	(44,937)	73,250
Non-cash stock compensation expense		202				202
Dividends declared			(6,105)			(6,105)
Other comprehensive income (loss), foreign currency translation adjustment				74		74
Net income			8,944			8,944
Balances at Jun. 30, 2021	31	172,844	(49,304)	(2,269)	(44,937)	76,365
Non-cash stock compensation expense		126				126
Dividends declared			(3,054)			(3,054)
Other comprehensive income (loss), foreign currency translation adjustment				(108)		(108)
Net income			9,657			9,657
Issuance of 23,581 common shares for the exercise of stock options		142				142
Balances at Sep. 30, 2021	31	173,112	(42,701)	(2,377)	(44,937)	83,128
Balances at Dec. 31, 2021	31	173,942	(36,112)	(2,375)	(50,149)	85,337
Purchase of shares treasury stock					(6,679)	(6,679)
Non-cash stock compensation expense		285				285
Dividends declared			(6,047)			(6,047)
Other comprehensive income (loss), foreign currency translation adjustment				51		51
Net income			8,539			8,539
Balances at Mar. 31, 2022	31	174,227	(33,620)	(2,324)	(56,828)	81,486
Balances at Dec. 31, 2021	31	173,942	(36,112)	(2,375)	(50,149)	85,337
Other comprehensive income (loss), foreign currency translation adjustment						(233)
Net income						25,159
Balances at Sep. 30, 2022	31	175,162	(28,870)	(2,608)	(75,949)	67,766
Balances at Mar. 31, 2022	31	174,227	(33,620)	(2,324)	(56,828)	81,486
Purchase of shares treasury stock					(15,475)	(15,475)
Non-cash stock compensation expense		334				334
Dividends declared			(5,944)			(5,944)
Other comprehensive income (loss), foreign currency translation adjustment				(99)		(99)
Net income			8,322			8,322
Balances at Jun. 30, 2022	31	174,561	(31,242)	(2,423)	(72,303)	68,624
Purchase of shares treasury stock					(3,646)	(3,646)
Non-cash stock compensation expense		291				291
Dividends declared			(5,926)			(5,926)
Other comprehensive income (loss), foreign currency translation adjustment				(185)		(185)
Net income			8,298			8,298
Issuance of 23,581 common shares for the exercise of stock options		310				310
Balances at Sep. 30, 2022	$ 31	$ 175,162	$ (28,870)	$ (2,608)	$ (75,949)	$ 67,766