Note I - Shareholders' Equity (Details Textual)	12 Months Ended
	Jun. 30, 2017 $ / shares $ / item shares	Jun. 30, 2016 $ / shares shares	Jun. 30, 2015 $ / shares shares
Multiple of Exercise Price	2
Redemption Price of Right | $ / item	0.01
Preferred Stock, Shares Authorized	200,000	200,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Capital Shares Reserved for Future Issuance	150,000
Common Stock, Shares, Outstanding	11,519,133	11,350,174	11,267,347
Treasury Stock, Shares	1,580,335	1,749,294	1,832,121
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0	1,750
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	315,000	315,000	315,000
Common Stock, Dividends, Per Share, Cash Paid | $ / shares	$ 0	$ 0.18	$ 0.36
Number of Preferred Stock Purchase Rights Per Outstanding Share of Common Stock	1
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	0.25
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 125
Number of Business Days Following Public Announcement to Exercise Right	10 days
Beneficial Ownership of Company's Common Stock	20.00%
Beneficial Ownership of Company's Common Stock for ExistingHolder	30.00%
Treasury Stock, Shares, Acquired	0	0	0
Treasury Stock [Member]
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	168,959	83,377	49,314