Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Receivables allowance for doubtful accounts (in Dollars)	$ 24	$ 24
Preferred stock, percentage non-cumulative	5.00%	5.00%
Preferred stock, par value (in Dollars per share)	$ 10	$ 10
Preferred stock, shares authorized	1,000	1,000
Preferred stock, shares issued	437	437
Preferred stock, shares outstanding	437	437
Common stock, par value (in Dollars per share)	$ 0	$ 0
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	18,115,965	18,115,965
Common stock, shares outstanding	16,797,420	16,658,765
Treasury stock, shares	1,318,545	1,457,200