Note 6 - Revenue 2 (Details Textual) $ in Millions	Mar. 31, 2022 USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 1.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Revenue, Remaining Performance Obligation, Amount	$ 3.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01
Revenue, Remaining Performance Obligation, Amount	$ 7.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	12 months