Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accounts receivable allowance	$ 292	$ 358
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 Outstanding (in shares)	250,000	250,000
Preferred stock, shares issued (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)	2,755,178	2,740,178
Common stock, shares outstanding (in shares)		2,740,178