Note 7 - Inventories (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Inventory Write-down	$ 2,229	$ 3,222
Inventory, Raw Materials, Gross	26,832	25,609
Inventory, Noncurrent	24,888	12,526
Semi-finished Goods and Component Parts [Member]
Inventory, Raw Materials, Gross	10,600	$ 9,400
Raw Materials and Work in Process to Be Transferred to Rental Equipment [Member]
Inventory, Noncurrent	$ 3,200