Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands	Sep. 30, 2023	Jun. 30, 2023
Allowance for doubtful accounts	$ 212	$ 217
Provision for obsolete inventory	$ 648	$ 648
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, authorized (in shares)	15,000,000	15,000,000
Common stock, issued (in shares)	4,096,680	4,096,680
Common stock, outstanding (in shares)	4,096,680	4,096,680