Note 2 - Revenue Recognition - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Total revenue	$ 124,509	$ 89,253
Product [Member]
Total revenue	73,333	64,109
Asia [Member] | Product [Member]
Total revenue	13,006	10,978
CANADA | Product [Member]
Total revenue	1,032	890
Europe [Member] | Product [Member]
Total revenue	5,976	15,705
South America [Member] | Product [Member]
Total revenue	448	719
UNITED STATES | Product [Member]
Total revenue	49,828	33,778
Other [Member] | Product [Member]
Total revenue	$ 3,043	$ 2,039