Note 3 - Revenue From Contracts With Customers 2 (Details Textual) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01	Sep. 30, 2019
Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	2 years
Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	5 years