Note I - Treasury Stock (Details Textual) - USD ($)	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	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, Shares, Acquired	674	734
Treasury Stock Acquired, Average Cost Per Share	$ 9.65	$ 10.70
Payments Related to Tax Withholding for Share-based Compensation	$ 6,000
Treasury Stock, Value, Acquired, Cost Method		$ 8,000
Excluding Restricted Stock Purchased [Member]
Treasury Stock, Shares, Acquired	0	0
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