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Note 6 - Fair Value of Financial Instruments - Fair Value by Hierarchy (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Aug. 31, 2025	Aug. 01, 2025	Sep. 30, 2024
Fair Value, Recurring [Member]
Short term investment				$ 30,227
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Short term investment				21,849
Fair Value, Recurring [Member] | US Treasury and Government Short-Term Debt Securities [Member]
Short term investment				8,378
Fair Value, Nonrecurring [Member]
Note receivable on sale of subsidiary				2,600
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Short term investment				0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Short term investment				0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]
Note receivable on sale of subsidiary				0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Short term investment				30,227
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Short term investment				21,849
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury and Government Short-Term Debt Securities [Member]
Short term investment				8,378
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]
Note receivable on sale of subsidiary				0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Short term investment				0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Short term investment				0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Note receivable on sale of subsidiary				2,600
Geovox [Member]
Contingent consideration	$ (2,540)	$ (2,500)	$ (2,500)	$ 0
Geovox [Member] | Fair Value, Recurring [Member]
Contingent consideration	(2,540)
Geovox [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Contingent consideration	0
Geovox [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Contingent consideration	0
Geovox [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Contingent consideration	$ (2,540)

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X

- 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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