Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2015	3,015,099	232,780
Balance at Dec. 31, 2015	$ 30	$ 2	$ 3,881	$ (20,073)	$ (16,160)
Net income				5,146	5,146
Stock-based compensation expense			415		415
Tax withholdings paid on behalf of employees for restricted stock units			(109)		(109)
Issuance of Common Stock (in shares)	43,871
Issuance of Common Stock	$ 1		(1)
Conversion of Class B Stock to Class A Stock (in shares)	232,780
Conversion of Class B Stock to Class A Stock	$ 2
Conversion of Class B Stock to Class A Stock (in shares)		(232,780)
Conversion of Class B Stock to Class A Stock		$ (2)
Balance (in shares) at Dec. 31, 2016	3,291,750
Balance at Dec. 31, 2016	$ 33		4,186	(14,927)	(10,708)
Net income				12,115	12,115
Stock-based compensation expense			308		308
Tax withholdings paid on behalf of employees for restricted stock units			(209)		(209)
Issuance of Common Stock (in shares)	54,939
Issuance of Common Stock	$ 1				1
Balance (in shares) at Dec. 31, 2017	3,346,689
Balance at Dec. 31, 2017	$ 34		4,285	(2,812)	1,507
Net income				9,467	9,467
Stock-based compensation expense			308		308
Tax withholdings paid on behalf of employees for restricted stock units			(380)		(380)
Issuance of Common Stock (in shares)	41,935
Balance (in shares) at Dec. 31, 2018	3,388,624
Balance at Dec. 31, 2018	$ 34		$ 4,213	$ 6,655	$ 10,902