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Note 10 - Income Taxes - Income Tax Provision (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Current:    
Federal $ (188,549) $ 448,462
State (11,964)
Foreign 317,823 203,824
Current Income Tax Expense (Benefit) 117,310 652,286
Deferred    
Federal 732,895 70,223
State (79,598) 71,716
Foreign (59,074) (91,348)
Deferred Income Tax Expense (Benefit) 594,223 50,591
Total Income Tax Provision $ 711,533 $ 702,877