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Note 6 - Other Comprehensive Income - Accumulated Other Comprehensive Loss Balances (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Balance | $ 10,444,260 | $ 11,977,577
Balance | 6,255,729 | 10,444,260
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |
Balance | (5,365,364) | (5,593,878)
Accumulated Other Comprehensive Loss, Current period change | (684,983) | 228,514
Balance | (6,050,347) | (5,365,364)
AOCI Attributable to Parent [Member] |  |
Balance | (5,365,364) | (5,593,878)
Accumulated Other Comprehensive Loss, Current period change | (684,983) | 228,514
Balance | $ (6,050,347) | $ (5,365,364)

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