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Note 3 - Revenue Recognition 2 (Details Textual) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
$ in Millions
Dec. 31, 2020
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month) 1 year
Revenue, Remaining Performance Obligation, Amount $ 51.1
Minimum [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month) 1 year 30 days
Maximum [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month) 5 years
Long-term Contract with Customer [Member]  
Revenue, Remaining Performance Obligation, Amount $ 7.2