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Note 12 - Income Taxes (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Income Tax Expense (Benefit), Total $ 274,144 $ 158,451 $ 557,147 $ 2,867,339  
Effective Income Tax Rate Reconciliation, Percent, Total     21.10%    
Income Tax Expense (Benefit), Excluding Adjustment of Deferred Tax (Asset) Liability       393,339  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability       $ 2,474,000  
Unrecognized Tax Benefits, Ending Balance $ 0   $ 0   $ 0