Note 2 - Revenue Recognition - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Total revenue	$ 32,715	$ 20,691	$ 95,194	$ 63,382
Product [Member]
Total revenue	19,727	13,463	56,976	48,060
Asia [Member] | Product [Member]
Total revenue	3,287	1,223	11,264	7,580
CANADA | Product [Member]
Total revenue	85	577	1,179	1,634
Europe [Member] | Product [Member]
Total revenue	1,856	1,625	4,782	14,368
UNITED STATES | Product [Member]
Total revenue	13,481	9,297	37,551	22,621
Other [Member] | Product [Member]
Total revenue	$ 1,018	$ 741	$ 2,200	$ 1,857