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Note 1 - Organization (Details Textual) $ / shares in Units, $ in Millions |  | 1 Months Ended | 5 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 15, 2024 USD ($) $ / shares shares | Jul. 31, 2025 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) $ / shares shares | Jun. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2025 $ / shares | Mar. 31, 2025 $ / shares | Apr. 18, 2024 $ / shares | Apr. 17, 2024 $ / shares
Common Stock, No Par Value (in dollars per share) |  |  |  |  |  |  | $ 0 |  | $ 0
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  | $ 0.01 |  | $ 0.01 |
Amplex Holdings [Member] |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | $ | $ 3.0 | $ 4.5 | $ 4.5 | $ 3.0 |  |  |  |  |
Investment, Shares Acquired During the Period (in shares) | shares | 1,674 | 4,120 | 2,583 | 1,674 |  |  |  |  |
Investment, Shares Acquired, Price Per Share (in dollars per share) | $ 1,792.55 | $ 1,092.26 | $ 1,742.16 | $ 1,792.55 |  |  |  |  |
Subsidiary, Ownership Percentage, Parent | 56.50% | 66.40% | 60.90% | 56.50% | 56.50% | 66.40% |  |  |
Conversion of Principal and Accrued Interest Into Amplex Shares [Member] |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ | $ 0.8 |  |  |  | $ 0.8 |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares | 421 |  |  |  | 421 |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued, Price Per Share (in dollars per share) | $ 1,792.55 |  |  |  | $ 1,792.55 |  |  |  |
Broadband [Member] | Amplex Holdings [Member] |  |  |  |  |  |  |  |  |
Number of Customers |  |  |  |  |  | 13,400 |  |  |
Fiber [Member] | Amplex Holdings [Member] |  |  |  |  |  |  |  |  |
Number of Customers |  |  |  |  |  | 5,400 |  |  |
Fiber Passings [Member] | Amplex Holdings [Member] |  |  |  |  |  |  |  |  |
Number of Customers |  |  |  |  |  | 15,000 |  |  |
Amplex Holdings [Member] |  |  |  |  |  |  |  |  |
Investment, Shares Acquired, Price Per Share (in dollars per share) |  | $ 1,092.26 | $ 1,742.16 |  |  |  |  |  |
Amplex Holdings [Member] |  |  |  |  |  |  |  |  |
Common Stock, No Par Value (in dollars per share) | $ 0 |  |  |  |  |  |  |  |
Business Combination, Voting Equity Interest Acquired, Percentage | 51.00% |  |  |  |  |  |  |  |

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