CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY (unaudited) - USD ($) $ in Thousands	Class B Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	AOCI (Loss), Net	Total
Balance at Dec. 31, 2017	$ 3	$ 81	$ 211,145	$ 25,861	$ (206)	$ 236,884
Balance (in shares) at Dec. 31, 2017	272,636	8,196,310
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net			(33)			(33)
Repurchase of shares for exercise of stock options and tax withholding for restricted stock vesting			(72)			(72)
Repurchase of shares for exercise of stock options and tax withholding for restricted stock vesting (in shares)		(1,385)
Employee stock-based compensation			293			293
Net income				6,291		6,291
Other comprehensive income (loss)					(322)	(322)
Balance at Mar. 31, 2018	$ 3	$ 81	211,333	32,152	(528)	243,041
Balance (in shares) at Mar. 31, 2018	272,636	8,194,925
Balance at Dec. 31, 2018	$ 3	$ 82	213,490	51,415	(473)	264,517
Balance (in shares) at Dec. 31, 2018	272,636	8,217,274
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of shares for exercise of stock options and tax withholding for restricted stock vesting			(88)			(88)
Repurchase of shares for exercise of stock options and tax withholding for restricted stock vesting (in shares)		(2,881)
Employee and non-employee restricted stock, net of forfeiture			686			686
Employee and non-employee restricted stock, net of forfeiture (in shares)		106,423
Net income				8,531		8,531
Cumulative effect of adopting new accounting standard | ASU 2016-01				(68)	68
Cumulative effect of adopting new accounting standard | ASU 2014-09				(117)		(117)
Other comprehensive income (loss)					258	258
Balance at Mar. 31, 2019	$ 3	$ 82	$ 214,088	$ 59,761	$ (147)	$ 273,787
Balance (in shares) at Mar. 31, 2019	272,636	8,320,816