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Note 3 - Revenue 2 (Details Textual) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
$ in Millions
Dec. 31, 2019
USD ($)
Revenue, Remaining Performance Obligation, Amount $ 105.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year