Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017
Revenues	$ 16,252	[1]	$ 16,946	$ 49,867	[1]	$ 51,732
Operating expenses
Cost of services	7,578		7,610	23,026		23,468
Selling, general and administrative expenses	2,382		2,588	7,691		7,762
Depreciation and amortization	1,756		1,834	5,382		5,515
Total operating expenses	11,716		12,032	36,099		36,745
Income from operations	4,536		4,914	13,768		14,987
Other income (expense)
Interest expense	(1,459)		(2,567)	(4,384)		(7,749)
Other income	83			252		204
Total other expense	(1,376)		(2,567)	(4,132)		(7,545)
Income before income tax expense	3,160		2,347	9,636		7,442
Income tax expense	(834)		(758)	(2,406)		(2,709)
Net income	$ 2,326		$ 1,589	$ 7,230		$ 4,733
Weighted average number of common shares outstanding:
Basic (in shares)	3,388,624		3,346,689	3,388,624		3,346,689
Diluted (in shares)	3,454,936		3,445,632	3,438,386		3,445,632
Basic net income per common share (in dollars per share)	$ 0.69		$ 0.47	$ 2.13		$ 1.41
Diluted net income per common share (in dollars per share)	$ 0.67		$ 0.46	$ 2.10		$ 1.37

[1] Revenue generated from sources not within the scope of ASU 2014-09.