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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.