Note 2 - Revenue Recognition - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Revenue from Contract with Customer, Excluding Assessed Tax	$ 135,598	$ 124,509
Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	116,036	73,333
Asia [Member] | Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	43,831	13,006
CANADA | Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1,578	1,032
Europe [Member] | Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	6,430	5,976
MEXICO | Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1,959	1,792
South America [Member] | Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	384	448
UNITED STATES | Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	61,009	49,828
Other [Member] | Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 845	$ 1,251