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Note 5 - Marketable Securities (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Jun. 30, 2015
Marketable Securities, Current $ 0   $ 0   $ 2,198,000
Marketable Securities, Gain (Loss) $ 0 $ 0 $ 0 $ 0