Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Taxes
Statutory federal income tax rate (as a percent)	34.00%
Income tax at federal rate	$ 88	$ 540
Increase (decrease) resulting from:
State income taxes, net of federal income tax	12	67
Permanent difference for compensation limitation		124
Expense reflected in tax basis	16
Other permanent differences	4	106
Capital goods excise tax credit	(14)	(223)
Total income tax provision	106	614
Unrecognized Tax Benefits	0
Interest or penalties related to tax assessments recognized	$ 0	$ 0