Note 6 - Inventories (Details Textual) - USD ($)	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2023
Inventory Write-down	$ 20,000	$ 1,380,000
Inventory, Raw Materials, Gross	27,551,000		$ 26,832,000
Semi-finished Goods and Component Parts [Member]
Inventory, Raw Materials, Gross	$ 9,900,000		$ 10,600,000