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Note I - Shareholders' Equity (Details Textual)
 12 Months Ended
Jun. 30, 2008
$ / shares
$ / item
shares
Jun. 30, 2016
$ / shares
shares
Jun. 30, 2015
$ / shares
shares
Jun. 30, 2014
$ / shares
shares
Treasury Stock [Member]        
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures   83,377 49,314 51,921
Stock Repurchase Program, Number of Shares Authorized to be Repurchased   315,000 315,000 315,000
Number of Preferred Stock Purchase Rights Per Outstanding Share of Common Stock 1      
Preferred Stock, Shares Issued   0 0  
Common Stock, Shares, Outstanding   11,350,174 11,267,347 11,261,873
Treasury Stock, Shares   1,749,294 1,832,121 1,837,595
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   1,750 46,240  
Common Stock, Dividends, Per Share, Cash Paid | $ / shares   $ 0.18 $ 0.36 $ 0.36
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%      
Beneficial Ownership of Company's Common Stock as Result of Transfer 20.00%      
Number of Business Days Following Commencement of Tender Offer 10 days      
Beneficial Ownership of Common Stock Under Second Condition Minimum 20.00%      
Beneficial Ownership of Common Stock for Existing Holder Under Second Condition 30.00%      
Multiple of Exercise Price 2      
Redemption Price of Right | $ / item 0.01      
Preferred Stock, Shares Authorized   200,000 200,000  
Preferred Stock, Capital Shares Reserved for Future Issuance   150,000