CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 24	$ 24
Preferred Stock, par value (in dollars per share)	$ 10	$ 10
Preferred Stock, authorized (in shares)	1,000	1,000
Preferred Stock, issued (in shares)	437	437
Preferred Stock, outstanding (in shares)	437	437
Preferred Stock, dividend rate	5.00%	5.00%
Common Stock, par value (in dollars per share)	$ 0	$ 0
Common Stock, authorized (in shares)	40,000,000	40,000,000
Common Stock, issued (in shares)	18,115,965	18,115,965
Common Stock, outstanding (in shares)	16,915,862	17,028,125
Treasury Stock (in shares)	1,200,103	1,087,840