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Note 5 - Fair Value of Financial Instruments - Fair Value by Hierarchy (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Recurring [Member]
Short term investment	$ 30,227	$ 14,921
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Short term investment	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Short term investment	30,227	14,921
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Short term investment	0	0
Fair Value, Nonrecurring [Member]
Note receivable on sale of subsidiary	2,600
Fair Value, Nonrecurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Note receivable on sale of subsidiary	0
Fair Value, Nonrecurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Note receivable on sale of subsidiary	0
Fair Value, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Note receivable on sale of subsidiary	2,600
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member]
Short term investment	21,849	11,295
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Short term investment	0	0
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Short term investment	21,849	11,295
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Short term investment	0	0
US Treasury and Government Short-Term Debt Securities [Member] \| Fair Value, Recurring [Member]
Short term investment	8,378	3,626
US Treasury and Government Short-Term Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Short term investment		0
US Treasury and Government Short-Term Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Short term investment	$ 8,378	3,626
US Treasury and Government Short-Term Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Short term investment		$ 0