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Note 3 - Summary of Significant Accounting Policies - Significant Exchange Rates (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Canadian Dollars spent in Canada and Cuba [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 2.8431 | 2.638 | 2.4214
Average rate |  | 2.8092 | 2.4567 | 2.6348
Dominican Pesos spent in the Dominican Republic [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 0.077 | 0.0685 | 0.07
Average rate |  | 0.0734 | 0.0674 | 0.0755
US Dollars spent in Ecuador, Panama and Cuba [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate | [1],[2] | 3.8748 | 3.308 | 3.2591
Average rate | [1],[2] | 3.6348 | 3.2017 | 3.4749
Quetzal spent in Guatemala [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 0.5001 | 0.45 | 0.4343
Average rate |  | 0.4837 | 0.4344 | 0.457
Novo Sol spent in Peru [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate | [2] |  |  | 0.972
Average rate | [2] |  |  | 1.0269
Argentinean Peso spent in Argentina [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 0.1025 | 0.1762 | 0.2056
Average rate |  | 0.1371 | 0.1931 | 0.2354
Bolivian Peso spent in Bolivia [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 0.5567 | 0.4753 | 0.4683
Average rate |  | 0.5222 | 0.46 | 0.4993
Guarani spent in Paraguai [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 0.0007 | 0.0006 | 0.0006
Average rate |  | 0.0006 | 0.0006 | 0.0006
Uruguayan Peso spent in Uruguay [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 0.1196 | 0.1151 | 0.1114
Average rate |  | 0.1181 | 0.1116 | 0.1166
Chilean Peso spent in Chile [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 0.0056 | 0.0054 | 0.0049
Average rate |  | 0.0057 | 0.0049 | 0.0051
Peso colombiano spent in Colombia [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate | [2] |  |  | 0.0011
Average rate | [2] |  |  | 0.0011
Barbadian Dollar spent in Barbados [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 1.9101 | 1.6307 | 1.6075
Average rate |  | 1.7918 | 1.5783 | 1.7139
[1] | The functional currency of Cuba, the Cuban convertible peso ("CUC"), has a fixed parity with the dollar ("USD") at balance sheet date.
[2] | Until December 31, 2016, due to exchange of shareholdings, according the Note 1 - Corporate information.

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