Note 2 - Summary of Significant Accounting Policies 2 (Details Textual) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01	Dec. 31, 2020
Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	1 year
Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	3 years