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Note 5 - Business Segment Reporting (Details Textual)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Reportable Segments 4    
Customer Concentration Risk [Member] | Revenue Benchmark [Member]      
Number of Major Customers 0 1 1
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]      
Concentration Risk, Percentage   16.00% 14.00%