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Note 6 - Other Comprehensive Income - Accumulated Other Comprehensive Loss Balances (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Balance $ 6,255,729  
Accumulated Other Comprehensive Loss, Current period change 310,160  
Balance 1,126,507 $ 6,255,729
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Balance (6,050,347) (5,365,364)
Accumulated Other Comprehensive Loss, Current period change 701,535 (684,983)
Balance (5,348,812) (6,050,347)
AOCI Attributable to Parent [Member]    
Balance (6,050,347) (5,365,364)
Accumulated Other Comprehensive Loss, Current period change 701,535 (684,983)
Balance $ (5,348,812) $ (6,050,347)