Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Accounts receivable, allowance for doubtful accounts	$ 1,931	$ 1,612
Property and equipment, accumulated depreciation	$ 1,292	$ 1,216
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)	6,472,038	6,472,038
Common stock, shares outstanding (in shares)	6,472,038	6,472,038
Treasury stock, shares (in shares)	1,314,694	1,314,694