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Note 6 - Concentration of Credit Risk (Details Textual) - Customer Concentration Risk [Member]
Pure in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Revenue from Contract with Customer Benchmark [Member]          
Number of Major Customers 0 0 0 0  
Accounts Receivable [Member]          
Number of Major Customers     0   0