Shareholders' Equity - Calculation of earning per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Shareholders' Equity
Net Income	$ 165	$ 1,132	$ 714	$ 98	$ 1,003	$ 1,457	$ 707	$ 331	$ 2,109	$ 3,498
Weighted average common shares outstanding (basic) (in shares)									2,330	2,272
Unvested restricted stock (in shares)									56	81
Weighted average common shares outstanding (diluted) (in shares)									2,386	2,353
Basic
Net Income per share (in dollars per share)									$ 0.91	$ 1.54
Diluted
Net income per share (in dollars per share)									$ 0.88	$ 1.49