Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands	Dec. 31, 2022	Jun. 30, 2022
Allowance for doubtful accounts	$ 220	$ 243
Provision for obsolete inventory	$ 649	$ 674
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)	4,076,680	4,071,680
Common stock, outstanding (in shares)	4,076,680	4,071,680