Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Accounts receivable allowance	$ 303	$ 334	[1]
Contract with Customer, Asset, Allowance for Credit Loss, Current	$ 22	$ 0	[1]
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred Stock, Shares Authorized (in shares)	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)	2,737,178	2,690,633
Common Stock, Shares, Outstanding (in shares)	2,737,178	2,690,633

[1] The balance sheet at December 31, 2022 has been derived from the audited financial statements at that date