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Note 8 - Commitments and Contingencies (Tables)
3 Months Ended
Sep. 30, 2016
Notes Tables  
Shares Outstanding under Contingent Stock Bonuses Plan by Target Price Per Share [Table Text Block]
Target Price per share
  $ 5.00     $ 10.00     $ 20.00  
Number of shares
    50,000       40,000       27,500