Note 8 - Revenue 2 (Details Textual) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Revenue, Remaining Performance Obligation, Amount	$ 1.1	$ 1.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Amount		$ 3.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)		3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Revenue, Remaining Performance Obligation, Amount		$ 9.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Amount	$ 3.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01
Revenue, Remaining Performance Obligation, Amount	$ 8.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	12 months