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Note 6 - Fair Value Measurements (Tables) | 3 Months Ended
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Dec. 31, 2023
Notes Tables |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | December 31, 2023 |
|  | Cost Basis |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |  |  | Cash Equivalents |  |  | Short-term Securities |  |  | Long-term Securities |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 1,060 |  |  | $ | - |  |  | $ | - |  |  | $ | 1,060 |  |  | $ | 1,060 |  |  | $ | - |  |  | $ | - |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 302 |  |  |  | - |  |  |  | - |  |  |  | 302 |  |  |  | - |  |  |  | 302 |  |  |  | - |
U.S. government agency bonds |  |  | 1,161 |  |  |  | - |  |  |  | - |  |  |  | 1,161 |  |  |  | - |  |  |  | 1,161 |  |  |  | - |
Municipal securities |  |  | 3,707 |  |  |  | 4 |  |  |  | (3 | ) |  |  | 3,708 |  |  |  | - |  |  |  | 3,708 |  |  |  | - |
Corporate bonds |  |  | 3,607 |  |  |  | 1 |  |  |  | (2 | ) |  |  | 3,606 |  |  |  | - |  |  |  | 3,606 |  |  |  | - |
Subtotal |  |  | 8,777 |  |  |  | 5 |  |  |  | (5 | ) |  |  | 8,777 |  |  |  | - |  |  |  | 8,777 |  |  |  | - |
Total |  | $ | 9,837 |  |  | $ | 5 |  |  | $ | (5 | ) |  | $ | 9,837 |  |  | $ | 1,060 |  |  | $ | 8,777 |  |  | $ | - |
|  | September 30, 2023 |
|  | Cost Basis |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |  |  | Cash Equivalents |  |  | Short-term Securities |  |  | Long-term Securities |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 2,307 |  |  | $ | - |  |  | $ | - |  |  | $ | 2,307 |  |  | $ | 2,307 |  |  | $ | - |  |  | $ | - |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 301 |  |  |  | - |  |  |  | - |  |  |  | 301 |  |  |  | - |  |  |  | 301 |  |  |  | - |
Municipal securities |  |  | 926 |  |  |  | - |  |  |  | (7 | ) |  |  | 919 |  |  |  | - |  |  |  | 919 |  |  |  | - |
Corporate bonds |  |  | 264 |  |  |  | - |  |  |  | (3 | ) |  |  | 261 |  |  |  | - |  |  |  | 261 |  |  |  | - |
Subtotal |  |  | 1,491 |  |  |  | - |  |  |  | (10 | ) |  |  | 1,481 |  |  |  | - |  |  |  | 1,481 |  |  |  | - |
Total |  | $ | 3,798 |  |  | $ | - |  |  | $ | (10 | ) |  | $ | 3,788 |  |  | $ | 2,307 |  |  | $ | 1,481 |  |  | $ | - |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
|  | As of December 31, 2023 |
|  | In loss position < 12 months |  |  | In loss position > 12 months |  |  | Total in loss position |
|  | Fair Value |  |  | Gross Unrealized Loss |  |  | Fair Value |  |  | Gross Unrealized Loss |  |  | Fair Value |  |  | Gross Unrealized Loss |
Certificates of deposit |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
U.S. government agency bonds |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Municipal securities |  |  | 628 |  |  |  | (1 | ) |  |  | 132 |  |  |  | (2 | ) |  |  | 760 |  |  |  | (3 | )
Corporate bonds |  |  | 2,882 |  |  |  | (2 | ) |  |  | - |  |  |  | - |  |  |  | 2,882 |  |  |  | (2 | )
|  | $ | 3,510 |  |  | $ | (3 | ) |  | $ | 132 |  |  | $ | (2 | ) |  | $ | 3,642 |  |  | $ | (5 | )
|  | As of September 30, 2023 |
|  | In loss position < 12 months |  |  | In loss position > 12 months |  |  | Total in loss position |
|  | Fair Value |  |  | Gross Unrealized Loss |  |  | Fair Value |  |  | Gross Unrealized Loss |  |  | Fair Value |  |  | Gross Unrealized Loss |
Certificates of deposit |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
U.S. government agency bonds |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Municipal securities |  |  | 684 |  |  |  | (2 | ) |  |  | 235 |  |  |  | (5 | ) |  |  | 919 |  |  |  | (7 | )
Corporate bonds |  |  | - |  |  |  | - |  |  |  | 261 |  |  |  | (3 | ) |  |  | 261 |  |  |  | (3 | )
|  | $ | 684 |  |  | $ | (2 | ) |  | $ | 496 |  |  | $ | (8 | ) |  | $ | 1,180 |  |  | $ | (10 | )
Business Combination, Fair Value Measurement of Acquired Intangible Assets [ Table Text Block] |
|  |  |  |  |  | Fair Value Measurements at December 31, 2023 |  |  |  |  |
|  | Carrying Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Gain/(Loss) |
Intangible assets from Evertel acquisition |  | $ | 2,550 |  |  | $ | - |  |  | $ | - |  |  | $ | 2,550 |  |  | $ | - |
Goodwill from Evertel acquisition |  | $ | 2,772 |  |  | $ | - |  |  | $ | - |  |  | $ | 2,772 |  |  | $ | - |
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block] |
Value at acquisition date |  | $ | 890 |
Remeasurement estimate |  |  | 46 |
Balance as of December 31, 2023 |  | $ | 936 |
Balance at acquisition date |  | $ | 230 |
Accretion |  |  | 5 |
Balance as of December 31, 2023 |  | $ | 235 |

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