Note 5 - Revenue Recognition 2 (Details Textual) $ in Thousands	Jun. 30, 2021 USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 12,185
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Amount	$ 10,187
Revenue, Remaining Performance Obligation, Percentage	84.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	12 months