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Note 3 - Gross Realized Gains and Losses on Available-for-Sale Securities (Details) - USD ($)
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Available-for-sale Securities, Gross Realized Gains $ 23,000 $ 572,000
Gross realized losses
Other than temporary impairment (91,000)
Total $ 23,000 $ 481,000