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Note 16 - Revenue 2 (Details Textual)
Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-12-31  
Revenue, Remaining Performance Obligation, Percentage 83.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-12-31  
Revenue, Remaining Performance Obligation, Percentage 13.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year