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Note 3 - Securities Available for Sale (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
May 31, 2014
Mutual Fund Investments [Member]          
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax        
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 91,000        
Reduction in Dividend from Mutual Fund Investment, Percentage         11.00%
Early Call Provision of a Corporate Bond [Member]          
Available-for-sale Securities Pledged as Collateral   79,100,000 $ 66,100,000    
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax   3,000 186,000    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities   91,000  
Available-for-sale Securities, Gross Realized Gains   23,000 572,000  
Proceeds from Sale of Available-for-sale Securities   4,800,000      
Proceeds from Sale and Maturity of Marketable Securities   $ 4,769,000 $ 994,000