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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.