Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Sep. 30, 2022	Jun. 30, 2022
Common Class A [Member]
Common Stock, Par value (in dollars per share)	$ 0.025	$ 0.025
Common Stock, Shares Authorized (in shares)	28,000,000	28,000,000
Common Stock, Shares, Issued (in shares)	13,866,999	13,866,999
Common Stock, Shares, Outstanding (in shares)	12,852,968	12,888,950
Treasury Stock, Shares (in shares)	1,014,031	978,049
Common Class B [Member]
Common Stock, Par value (in dollars per share)	$ 0.025	$ 0.025
Common Stock, Shares Authorized (in shares)	4,500,000	4,500,000
Common Stock, Shares, Issued (in shares)	0	0
Common Class C [Member]
Common Stock, Par value (in dollars per share)	$ 0.025	$ 0.025
Common Stock, Shares Authorized (in shares)	3,500,000	3,500,000
Common Stock, Shares, Issued (in shares)	2,068,549	2,068,549
Common Stock, Shares, Outstanding (in shares)	2,068,549	2,068,549