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Note 19 - Major Customers and Accounts Receivable (Details Textual) - Customer Concentration Risk [Member]
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Revenue Benchmark [Member]          
Concentration Risk, Number of Major Customers 1   1    
Revenue Benchmark [Member] | One Customer [Member]          
Concentration Risk, Percentage 28.00% 13.00% 16.00% 21.00%  
Current Accounts Receivable [Member]          
Concentration Risk, Number of Major Customers     2   1
Current Accounts Receivable [Member] | One Customer [Member]          
Concentration Risk, Percentage         31.00%
Current Accounts Receivable [Member] | Nigerian Customer [Member]          
Concentration Risk, Percentage     41.00%    
Current Accounts Receivable [Member] | Second Customer Member          
Concentration Risk, Percentage     26.00%