Note 2 - Revenue From Contracts With Customers 2 (Details Textual) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01	Mar. 31, 2020
Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	2 years
Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	5 years