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Note 9 - Revenue 2 (Details Textual)
Sep. 30, 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01  
Revenue, Remaining Performance Obligation, Percentage 33.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) 3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01  
Revenue, Remaining Performance Obligation, Percentage 53.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) 1 year