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Note 5 - Concentration of Credit Risk (Details Textual)
Pure in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member]        
Number of Major Customers 0 0 0 0