Restricted Stock Plan (Details) - Restricted stock plan - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock options
Shares reserved for issuance thereunder	405,805
Weighted Average Grant Date Fair Value
Stock based compensation expense, before tax	$ 22	$ 36
Stock based compensation expense, net of tax	16	$ 26
Total unrecognized compensation cost related to non-vested restricted stock units	$ 26
Weighted-average period over which unrecognized compensation cost will be recognized	1 year
Minimum
Stock options
Vesting period (in years)	2 years
Maximum
Stock options
Vesting period (in years)	3 years
Employees
Shares
Non-vested balance at beginning of period (in shares)	9,000
Granted (in shares)		9,000	5,000
Vested (in shares)	(3,000)
Non-vested balance at end of period (in shares)	6,000	9,000
Weighted Average Grant Date Fair Value
Non-vested balance at beginning of period (in dollars per share)	$ 7.30
Vested (in dollars per share)	7.30
Non-vested balance at end of period (in dollars per share)	$ 7.30	$ 7.30