Note 1 - Restatement of Previously Issued Consolidated Financial Statements - Summary of Error Correction and Restatement of Financial Statements (Details) (Parentheticals) - $ / shares	Jun. 30, 2022	Jun. 30, 2021
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	13,866,913
Common Stock, Shares, Outstanding (in shares)	12,888,950	12,967,960
Treasury Stock, Shares (in shares)	978,049	898,953
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	2,068,635
Common Stock, Shares, Outstanding (in shares)	2,068,549	2,068,635