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Note 3 - Stock Purchase Agreement (Details Textual) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jun. 03, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Anaconda Pharma [Member]        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 3.5      
Payments to Acquire Businesses, Gross $ 8.0      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 30.0      
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 7.5      
Business Acquisition, Share Price $ 2.14      
Business Combination, Acquisition Related Costs $ 1.0      
Research and Development in Process 17.6 $ 17.6    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities $ 1.0 1.0    
Notes Payable   0.7 $ 1.0  
Research and Development in Process   $ 17.6