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Note 4 - Revenue 1 (Details Textual)
$ in Millions
3 Months Ended
Mar. 31, 2024
USD ($)
Revenue, Remaining Performance Obligation, Amount $ 5
Minimum [Member]  
Service Contracts, Term (Year) 12 years
Maximum [Member]  
Service Contracts, Term (Year) 48 years
Revenue Benchmark [Member]  
Number Of Customers 1
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Major Direct Customer [Member]  
Concentration Risk, Percentage 12.00%