Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues	$ 66,068	$ 68,526	$ 68,944
Operating expenses
Cost of services	30,592	31,395	31,875
Selling, general and administrative expenses	10,451	10,147	10,234
Depreciation and amortization	7,232	7,377	8,022
Total operating expenses	48,275	48,919	50,131
Income from operations	17,793	19,607	18,813
Other income (expense)
Interest expense	(5,844)	(13,249)	(10,634)
Loss on debt prepayment penalty		(2,303)
Other income	263	204	625
Total other expense	(5,581)	(15,348)	(10,009)
Income before income tax (expense) benefit	12,212	4,259	8,804
Income tax (expense) benefit	(2,745)	7,856	(3,658)
Net income	$ 9,467	$ 12,115	$ 5,146
Weighted average number of common shares outstanding:
Basic (in shares)	3,388,624	3,346,689	3,283,177
Diluted (in shares)	3,434,862	3,445,632	3,404,696
Basic net income per common share (in dollars per share)	$ 2.79	$ 3.62	$ 1.57
Diluted net income per common share (in dollars per share)	$ 2.76	$ 3.52	$ 1.51