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Note 7 - Marketable Debt Securities (Tables) | 9 Months Ended
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Aug. 31, 2025
Notes Tables |
Marketable Securities [Table Text Block] |
|  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Investments |
Corporate bonds |  | $ | 1,475 |  |  | $ | 20 |  |  | $ | - |  |  | $ | 1,495 |  |  | $ | 1,495 |
U.S. Treasury securities |  |  | 999 |  |  |  | 7 |  |  |  | - |  |  |  | 1,006 |  |  |  | 1,006 |
Total |  | $ | 2,474 |  |  | $ | 27 |  |  | $ | - |  |  | $ | 2,501 |  |  | $ | 2,501 |
|  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Investments |
Corporate bonds |  | $ | 2,950 |  |  | $ | 18 |  |  | $ | - |  |  | $ | 2,968 |  |  | $ | 2,968 |
U.S. Treasury securities |  |  | 5,889 |  |  |  | 47 |  |  |  | - |  |  |  | 5,936 |  |  |  | 5,936 |
Total |  | $ | 8,839 |  |  | $ | 65 |  |  | $ | - |  |  | $ | 8,904 |  |  | $ | 8,904 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | August 31, 2025 |
|  | Cost |  |  | Fair Value |
Due within one year or less |  | $ | 1,475 |  |  | $ | 1,495 |
Due after one year through five years |  |  | 999 |  |  |  | 1,006 |
|  | $ | 2,474 |  |  | $ | 2,501 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  |  |  |  |  |  |  |  |  | August 31, 2025 |
|  |  |  |  |  |  |  |  |  | Fair Value Measurement Based on |
|  |  |  |  |  |  |  |  |  | Quoted Prices in Active Market |  |  | Significant Other Observable Inputs |  |  | Significant Unobservable Inputs |
|  | Cost |  |  | Fair Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Cash equivalents |  | $ | 551 |  |  | $ | 551 |  |  | $ | 551 |  |  | $ | - |  |  | $ | - |
Corporate bonds |  |  | 1,475 |  |  |  | 1,495 |  |  |  | - |  |  |  | 1,495 |  |  |  | - |
U.S. Treasury securities |  |  | 999 |  |  |  | 1,006 |  |  |  | - |  |  |  | 1,006 |  |  |  | - |
Total |  | $ | 3,025 |  |  | $ | 3,052 |  |  | $ | 551 |  |  | $ | 2,501 |  |  | $ | - |
|  |  |  |  |  |  |  |  |  | November 30, 2024 |
|  |  |  |  |  |  |  |  |  | Fair Value Measurement Based on |
|  |  |  |  |  |  |  |  |  | Quoted Prices in Active Market |  |  | Significant Other Observable Inputs |  |  | Significant Unobservable Inputs |
|  | Cost |  |  | Fair Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Cash equivalents |  | $ | 11,304 |  |  | $ | 11,304 |  |  | $ | 11,304 |  |  | $ | - |  |  | $ | - |
Corporate bonds |  |  | 2,950 |  |  |  | 2,968 |  |  |  | - |  |  |  | 2,968 |  |  |  | - |
U.S. Treasury securities |  |  | 5,889 |  |  |  | 5,936 |  |  |  | - |  |  |  | 5,936 |  |  |  | - |
Total |  | $ | 20,143 |  |  | $ | 20,208 |  |  | $ | 11,304 |  |  | $ | 8,904 |  |  | $ | - |

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