Note 3 - Revenue Recognition 2 (Details Textual) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023
Revenue, Remaining Performance Obligation, Amount	$ 0.7
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)		4 years