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Note 2 - Revenue Recognition 2 (Details Textual)
$ in Thousands
Dec. 31, 2019
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year
Revenue, Remaining Performance Obligation, Amount $ 76,200
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Revenue, Remaining Performance Obligation, Amount $ 7,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | Minimum [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year 30 days
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | Maximum [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 5 years