Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Retained Earnings [Member]
Beginning balance at Dec. 31, 2013	$ 65,178	$ 72	$ 5,781	$ (26)	$ 59,351
Beginning balance, shares at Dec. 31, 2013		7,165,000
Common stock issued on exercise of options	434		434
Common stock issued on exercise of options, shares		56,000
Common stock repurchased on vesting of restricted stock units	(407)		(407)
Common stock repurchased on vesting of restricted stock units, shares		(8,000)
Share based compensation expense, net of tax	1,699		1,699
Excess tax benefits from share-based compensation	578		578
Company repurchase of common stock	(3,676)	$ (1)	(3,675)
Company repurchase of common stock, shares		(87,000)
Cash dividends on common stock	(5,443)				(5,443)
Unrealized holding gains (loss) on investments, net of tax	3			3
Net income (loss)	(25,546)				(25,546)
Ending balance at Dec. 31, 2014	32,820	$ 71	4,410	(23)	28,362
Ending balance, shares at Dec. 31, 2014		7,126,000
Common stock issued on exercise of options	702	$ 1	701
Common stock issued on exercise of options, shares		89,000
Common stock repurchased on vesting of restricted stock units	(465)		(465)
Common stock repurchased on vesting of restricted stock units, shares		(12,000)
Share based compensation expense, net of tax	2,386		2,386
Excess tax benefits from share-based compensation	$ (68)		(68)
Company repurchase of common stock, shares	0
Cash dividends on common stock	$ (6,310)				(6,310)
Unrealized holding gains (loss) on investments, net of tax	(8)			(8)
Net income (loss)	25,494				25,494
Ending balance at Dec. 31, 2015	54,551	$ 72	6,964	(31)	47,546
Ending balance, shares at Dec. 31, 2015		7,203,000
Common stock issued on exercise of options	72		72
Common stock issued on exercise of options, shares		52,000
Common stock repurchased on vesting of restricted stock units	(433)		(433)
Common stock repurchased on vesting of restricted stock units, shares		(11,000)
Share based compensation expense, net of tax	2,782		2,782
Excess tax benefits from share-based compensation	$ 253		253
Company repurchase of common stock, shares	0
Cash dividends on common stock	$ (6,359)				(6,359)
Unrealized holding gains (loss) on investments, net of tax	28			28
Net income (loss)	18,799				18,799
Ending balance at Dec. 31, 2016	$ 69,693	$ 72	$ 9,638	$ (3)	$ 59,986
Ending balance, shares at Dec. 31, 2016		7,244,000