Note 2 - Revenue Recognition (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2023
Contract with Customer, Liability, Current	$ 0		$ 0		$ 700,000
Capitalized Contract Cost, Net, Current	0		0		$ 0
Contract with Customer, Liability, Revenue Recognized, Including Balance	20,000	$ 0	700,000	$ 0
Contract with Customer, Liability, Cost of Revenue Recognized	0	0	0	0
Transferred over Time [Member]
Contract with Customer, Liability, Revenue Recognized	$ 300,000	$ 100,000	$ 1,200,000	$ 200,000