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Note 9 - Business Segment Reporting (Details Textual)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Number of Operating Segments 1  
Customer Concentration Risk [Member] | Revenue Benchmark [Member]    
Number of Major Customers 0 1
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | BRAZIL    
Number of Major Customers 1