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Note 3 - Revenue Recognition 2 (Details Textual)
$ in Millions
Dec. 31, 2021
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month) 12 months
Revenue, Remaining Performance Obligation, Amount $ 80.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Revenue, Remaining Performance Obligation, Amount $ 8.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | Minimum [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month) 13 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | Maximum [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month) 60 months