Note 6 - Revenue 2 (Details Textual) $ in Thousands	Dec. 31, 2020 USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 1,700
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Amount	$ 4,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	90 days
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Amount	$ 9,100
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	1 year