Note H - Stockholders' Equity (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 28, 2017	May 11, 2015	Feb. 06, 2015	Jun. 02, 2011
Stock Repurchase Program, Authorized Amount			$ 7,000,000	$ 5,000,000	$ 3,000,000	$ 2,000,000
Treasury Stock, Value, Acquired, Cost Method	$ 1,367,000	$ 510,000
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	47,065	43,610
Shares Paid for Tax Withholding for Share-based Compensation, Average Cost Per Share	$ 11.26	$ 11.68
Payment, Tax Withholding, Share-based Payment Arrangement	$ 530,000	$ 510,000
Excluding Restricted Stock Purchased [Member]
Treasury Stock, Shares, Acquired	76,272	0
Treasury Stock Acquired, Average Cost Per Share	$ 10.97
Treasury Stock, Value, Acquired, Cost Method	$ 837,000
2015 Increase [Member]
Stock Repurchase Program, Authorized Amount				$ 2,000,000	$ 1,000,000
2017 Increase [Member]
Stock Repurchase Program, Authorized Amount			$ 2,000,000