Note 6 - Inventories (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Inventory, Raw Materials, Gross	$ 27,300	$ 25,609
Inventory, Noncurrent	22,311	12,526
Semi-finished Goods and Component Parts [Member]
Inventory, Raw Materials, Gross	9,300	$ 9,400
Raw Materials and Work in Process to Be Transferred to Rental Equipment [Member]
Inventory, Noncurrent	$ 5,100