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Note 6 - Other Comprehensive Income - Accumulated Other Comprehensive Loss Balances (Details)
6 Months Ended
Jun. 30, 2019
USD ($)
Balance $ 6,255,729
Balance 3,191,277
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]  
Balance (6,050,347)
Accumulated Other Comprehensive Loss, Current period change 297,209
Balance (5,753,138)
AOCI Attributable to Parent [Member]  
Balance (6,050,347)
Accumulated Other Comprehensive Loss, Current period change 297,209
Balance $ (5,753,138)