Note I - Stockholders' Equity (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 13, 2020	Jan. 08, 2020	Jan. 07, 2020
Stock Repurchase Program, Authorized Amount			$ 10,000,000	$ 9,000,000	$ 2,000,000
Treasury Stock, Value, Acquired, Cost Method	$ 3,747,000	$ 1,367,000
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)	61,913	47,065
Shares Paid for Tax Withholding for Share-based Compensation, Average Cost Per Share (in dollars per share)	$ 7.14	$ 11.26
Payment, Tax Withholding, Share-based Payment Arrangement	$ 400,000	$ 500,000
Excluding Restricted Stock Purchased [Member]
Treasury Stock, Shares, Acquired (in shares)	400,787	76,272
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 8.25	$ 10.97
Treasury Stock, Value, Acquired, Cost Method	$ 3,300,000	$ 837,000
2015 Increase [Member]
Stock Repurchase Program, Authorized Amount			$ 1,000,000