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Note 10 - Segment Reporting (Details Textual) - Customer Concentration Risk [Member]
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Revenue Benchmark [Member]          
Number of Major Customers 0 0 0 0  
Revenue Benchmark [Member] | One Customer [Member]          
Concentration Risk, Percentage     14.00%   13.30%
Accounts Receivable [Member]          
Number of Major Customers     1   1