Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2012	13,866,060
Balance at Dec. 31, 2012	$ 139,000	$ 65,431,000	$ 46,010,000	$ (2,655,000)	$ 108,925,000
Issuance of common stock for equity awards (in shares)	423,248
Issuance of common stock for equity awards	$ 4,000	3,050,000			3,054,000
Tax benefit related to equity awards		857,000			857,000
Stock-based compensation expense		1,268,000			1,268,000
Net income			20,575,000		20,575,000
Other comprehensive income				956,000	956,000
Balance (in shares) at Dec. 31, 2013	14,289,308
Balance at Dec. 31, 2013	$ 143,000	70,606,000	66,585,000	(1,699,000)	135,635,000
Issuance of common stock for equity awards (in shares)	696,169
Issuance of common stock for equity awards	$ 7,000	2,048,000			2,055,000
Tax benefit related to equity awards		9,626,000			9,626,000
Stock-based compensation expense		1,607,000			1,607,000
Net income			38,319,000		38,319,000
Other comprehensive income				(2,796,000)	(2,796,000)
Balance (in shares) at Dec. 31, 2014	14,851,703
Balance at Dec. 31, 2014	$ 149,000	77,540,000	104,904,000	(4,495,000)	178,098,000
Retirement of common stock for minimum tax withholdings (in shares)	(133,774)
Retirement of common stock for minimum tax withholdings	$ (1,000)	(6,347,000)			(6,348,000)
Issuance of common stock for equity awards (in shares)	185,105
Issuance of common stock for equity awards	$ 1,000	1,073,000			1,074,000
Tax benefit related to equity awards		847,000			847,000
Stock-based compensation expense		2,225,000			2,225,000
Net income			30,758,000		30,758,000
Other comprehensive income				(2,154,000)	(2,154,000)
Balance (in shares) at Dec. 31, 2015	15,036,808
Balance at Dec. 31, 2015	$ 150,000	$ 81,685,000	$ 135,662,000	$ (6,649,000)	$ 210,848,000