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Note 3 - Summary of Significant Accounting Policies - Significant Exchange Rates (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Canadian Dollars spent in Canada and Cuba [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 2.638 | 2.4214 | 2.8124
Average rate |  | 2.4567 | 2.6348 | 2.5661
Dominican Pesos spent in the Dominican Republic [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 0.0685 | 0.07 | 0.086
Average rate |  | 0.0674 | 0.0755 | 0.0725
US Dollars spent in Ecuador, Panama and Cuba [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate | [1],[2] | 3.308 | 3.2591 | 3.9048
Average rate | [1],[2] | 3.2017 | 3.4749 | 3.2596
Quetzal spent in Guatemala [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 0.45 | 0.4343 | 0.5129
Average rate |  | 0.4344 | 0.457 | 0.4265
Novo Sol spent in Peru [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate | [2] |  | 0.972 | 1.144
Average rate | [2] |  | 1.0269 | 1.0396
Argentinean Peso spent in Argentina [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 0.1762 | 0.2056 | 0.3003
Average rate |  | 0.1931 | 0.2354 | 0.3581
Bolivian Peso spent in Bolivia [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 0.4753 | 0.4683 | 0.561
Average rate |  | 0.46 | 0.4993 | 0.4683
Guarani spent in Paraguai [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 0.0006 | 0.0006 | 0.0007
Average rate |  | 0.0006 | 0.0006 | 0.0006
Uruguayan Peso spent in Uruguay [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 0.1151 | 0.1114 | 0.1304
Average rate |  | 0.1116 | 0.1166 | 0.1197
Chilean Peso spent in Chile [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 0.0054 | 0.0049 | 0.0055
Average rate |  | 0.0049 | 0.0051 | 0.005
Peso colombiano spent in Colombia [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate | [2] |  | 0.0011 | 0.0012
Average rate | [2] |  | 0.0011 | 0.0012
Barbadian Dollar spent in Barbados [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Closing rate |  | 1.6307 | 1.6075 |
Average rate |  | 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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