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Note 3 - Revenue 2 (Details Textual) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01 - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2019
Revenue, Remaining Performance Obligation, Amount $ 101.4  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period   1 year