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Note 9 - Income Taxes (Details Textual) - USD ($)
6 Months Ended 9 Months Ended
Dec. 31, 2016
Sep. 30, 2017
Operating Loss Carryforwards, Valuation Allowance $ 0 $ 0
Percentage of Valuation Allowance   100.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount $ 63,000 $ 18,339