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Note 7 - Marketable Debt Securities - Schedule of Fair Value Measurement (Details) - USD ($) $ in Thousands | Aug. 31, 2025 | Nov. 30, 2024
--- | --- | ---
Fair value | $ 2,501 | $ 8,904
Corporate Debt Securities [Member] |  |
Fair value | 1,495 | 2,968
US Treasury Securities [Member] |  |
Fair value | 1,006 | 5,936
Reported Value Measurement [Member] |  |
Cash equivalents | 551 | 11,304
Total | 3,025 | 20,143
Reported Value Measurement [Member] | Corporate Debt Securities [Member] |  |
Fair value | 1,475 | 2,950
Reported Value Measurement [Member] | US Treasury Securities [Member] |  |
Fair value | 999 | 5,889
Estimate of Fair Value Measurement [Member] |  |
Cash equivalents | 551 | 11,304
Total | 3,052 | 20,208
Estimate of Fair Value Measurement [Member] | Corporate Debt Securities [Member] |  |
Fair value | 1,495 | 2,968
Estimate of Fair Value Measurement [Member] | US Treasury Securities [Member] |  |
Fair value | 1,006 | 5,936
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents | 551 | 11,304
Total | 551 | 11,304
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |
Fair value | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |
Fair value | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash equivalents | 0 | 0
Total | 2,501 | 8,904
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Fair value | 1,495 | 2,968
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |
Fair value | 1,006 | 5,936
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash equivalents | 0 | 0
Total | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |
Fair value | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member] |  |
Fair value | $ 0 | $ 0

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