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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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