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Note 7 - Income Taxes - Income Tax Expense From Change in Tax Rate (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Transition tax on deemed repatriation of certain foreign earnings [1] $ 514,454  
Foreign Withholding Taxes [1] 290,128  
Remeasuring deferred tax position at the lowered income tax rate (463,800) [2] $ (401,000)
$ 340,782  
[1] classified as part of the Federal current provision in 2017
[2] classified as part of the Federal deferred benefit in 2017