Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Accounts receivable, allowance for doubtful account	$ 3,715	$ 3,760
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	7,204,506	7,174,506
Common stock, shares outstanding (in shares)	7,204,506	7,174,506