Consolidated Balance Sheet (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts receivable allowance	$ 343	$ 335
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred Stock, Shares Authorized	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	250,000	250,000
Preferred stock, shares outstanding (in shares)	250,000	250,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	9,000,000	9,000,000
Common stock, shares issued (in shares)	2,659,628	2,657,530
Common stock, shares outstanding (in shares)	2,659,628	2,657,530