Note I - Shareholders' Equity (Details Textual) - $ / shares $ / shares in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Common Stock, Shares, Outstanding, Ending Balance (in shares)	13,648,663	13,405,993
Treasury Stock, Shares, Ending Balance (in shares)	984,139	1,226,809
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)	249,480	186,226
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)	6,809	20,511
Treasury Stock, Shares, Acquired (in shares)	0	0
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares)	315,000	315,000
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)	$ 0
Preferred Stock, Shares Authorized (in shares)	200,000	200,000
Preferred Stock, Shares Issued, Total (in shares)	0	0
Preferred Stock, Capital Shares Reserved for Future Issuance (in shares)	150,000