Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ 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, 2015	$ 54,551	$ 72	$ 6,964	$ (31)	$ 47,546
Beginning balance, shares at Dec. 31, 2015		7,203
Common stock issued on exercise of options and vesting of restricted stock units	72		72
Common stock issued on exercise of options and vesting of restricted stock units, shares		8
Common stock repurchased on vesting of restricted stock units	(40)		(40)
Common stock repurchased on vesting of restricted stock units, shares		(1)
Share-based compensation expense	1,040		1,040
Excess tax benefits from share-based compensation	265		265
Cash dividends on common stock	(3,173)				(3,173)
Unrealized gain on investments, net of tax	54			54
Net income (loss)	519				519
Ending balance at Jun. 30, 2016	53,288	$ 72	8,301	23	44,892
Ending balance, shares at Jun. 30, 2016		7,210
Beginning balance at Dec. 31, 2016	69,693	$ 72	9,638	(3)	59,986
Beginning balance, shares at Dec. 31, 2016		7,244
Common stock issued on exercise of options and vesting of restricted stock units	145	$ 1	144
Common stock issued on exercise of options and vesting of restricted stock units, shares		14
Common stock repurchased on vesting of restricted stock units	(134)		(134)
Common stock repurchased on vesting of restricted stock units, shares		(2)
Share-based compensation expense	1,772		1,772
Cash dividends on common stock	(3,625)				(3,625)
Unrealized gain on investments, net of tax	113			113
Net income (loss)	(101)				(101)
Ending balance at Jun. 30, 2017	$ 67,863	$ 73	$ 11,420	$ 110	$ 56,260
Ending balance, shares at Jun. 30, 2017		7,256