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Note 4 - Segment Information (Details Textual)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Number of Operating Segments 1  
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member]    
Number of Major Customers 1 1
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member]    
Concentration Risk, Percentage 15.00% 18.00%