Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023
Allowance for doubtful accounts	$ 508	$ 449
Class A
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares, issued (in shares)	8,340,540	8,265,033
Common stock, shares, outstanding (in shares)	6,932,646	6,853,673
Class B
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, shares, issued (in shares)	851,907	875,192
Common stock, shares, outstanding (in shares)	551,039	576,396