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Note 4 - Fair Value of Financial Instruments - Fair Value by Hierarchy (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Fair Value, Recurring [Member]
Total	$ 11,531	$ 30,227
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total	11,531	30,227
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total	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	9,279	21,849
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	9,279	21,849
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	2,252	8,378
US Treasury and Government Short-Term Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Short term investment	0	0
US Treasury and Government Short-Term Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Short term investment	2,252	8,378
US Treasury and Government Short-Term Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Short term investment	$ 0	$ 0

X

- Definition

Fair value portion of asset recognized for present right to economic benefit.

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables.

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