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Note 3 - Revenue Recognition - Remaining Performance Obligation (Details) (Parentheticals)
Jun. 30, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01  
Remaining revenue (Year) 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Remaining revenue (Year) 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Remaining revenue (Year) 1 year