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Note 3 - Revenue Recognition - Schedule of Concentration Risk (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member]
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Purchaser A [Member]    
Concentration risk percentage 23.00% 24.00%
Purchaser B [Member]    
Concentration risk percentage 19.00% 21.00%