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Note 17 - Major Customers and Accounts Receivables (Details Textual) - Customer Concentration Risk [Member]
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue Benchmark [Member]          
Concentration Risk, Number of Major Customers 1 2 3 3  
Concentration Risk, Percentage 41.00% 59.00% 60.00% 58.00%  
Current Accounts Receivable [Member]          
Concentration Risk, Number of Major Customers     3   3
Current Accounts Receivable [Member] | Customer A [Member]          
Concentration Risk, Percentage     13.00%   18.00%
Current Accounts Receivable [Member] | Customer B [Member]          
Concentration Risk, Percentage     12.00%   16.00%
Current Accounts Receivable [Member] | Customer C [Member]          
Concentration Risk, Percentage     10.00%   14.00%