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Note 19 - Commitments and Contingencies (Details Textual) - USD ($) | Aug. 01, 2025 | Jul. 31, 2021 | Sep. 30, 2025 | Aug. 31, 2025 | Sep. 30, 2024
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Geovox [Member] |  |  |  |  |
Business Combination, Contingent Consideration, Liability | $ 2,500,000 |  | $ 2,540,000 | $ 2,500,000 | $ 0
Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount | $ 3,300,000 |  |  | $ 3,300,000 |
Business Combination, Contingent Consideration, Earn Out Period (Year) | 4 years |  |  |  |
Aquana, LLC [Member] |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  | $ 100,000 |  | $ 17,000
Business Combination, Contingent Consideration, Earn Out Period (Year) |  | 7 years |  |  |
Business Combination, Required Continued Employment of Key Employees, Period (Year) |  | 5 years |  |  |

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