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v3.25.3

Note 10 - Capital Stock (Details Textual) |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 14 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 10, 2025 USD ($) | Jul. 23, 2024 USD ($) | May 09, 2024 USD ($) $ / shares shares | May 31, 2024 shares | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) $ / shares shares | Dec. 31, 2024 $ / shares shares | May 31, 2022 shares | Apr. 25, 2022 $ / shares shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.001
Offering of Debt Securities and Warrants, Maximum (in shares) |  |  |  |  |  |  |  |  |  |  | 500,000,000
Treasury Stock, Value, Acquired, Cost Method | $ |  |  |  |  | $ 1,380,180 |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  |  | 0 |  | 0 | 53,562 |  |
Payments for Repurchase of Equity | $ |  |  |  |  |  | $ 87,170 | $ 18,141,551 |  |  |  |
Separation Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  | $ 0.0001 |  |  |  |  |  |  |  |
Securities Repurchase Agreement, Consideration Transferred | $ |  |  | $ 9,175,605 |  |  |  |  |  |  |  |
Payments for Repurchase of Equity | $ |  |  | $ 8,800,480 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Repurchase of Equity (in shares) |  |  | 36,705 |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Shares Issued (in shares) |  |  | 200,000 |  |  |  |  |  |  |  |
Severance Costs | $ |  |  | $ 960,000 |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Recorded Liability | $ |  |  | 75,000 |  |  |  |  |  |  |  |
Compensation Expense, Excluding Cost of Good and Service Sold | $ |  |  | $ 250,000 |  |  |  |  |  |  |  |
Warrants for Common Class B Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  |  |  |  |  | 53,562 |  |
Common Stock, Voting Rights Per Share |  |  |  |  |  |  |  |  | 10 |  |
Class of Warrant or Right, Exercised Shares, Value | $ | $ 52,778 |  |  |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises | $ | $ 525,000 |  |  |  |  |  |  |  |  |  |
Warrants for Common Class B Stock [Member] | Separation Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Repurchased During the Period (in shares) |  |  | 51,994 |  |  |  |  |  |  |  |
Warrants for Common Class A Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  |  | 0 |  | 0 | 784 |  |
Boulderado [Member] | Separation Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Securities Repurchase Agreement, Consideration Transferred | $ |  |  | $ 9,951,113 |  |  |  |  |  |  |  |
Payments for Repurchase of Equity | $ |  |  | $ 7,960,891 |  |  |  |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |
Maximum Shares of Common Stock Registered by Certain Selling Shareholders (in shares) |  |  |  |  |  |  |  |  |  |  | 8,297,093
Shares of Common Stock Registered by Certain Selling Shareholders (in shares) |  |  |  |  |  | 8,555,957 |  | 8,555,957 |  |  |
Common Class A [Member] | Separation Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares (in shares) |  |  | 210,000 |  |  |  |  |  |  |  |
Common Class A [Member] | Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  |  |  |  |  | 0 |  | 111,323 |  |  |
Share Repurchase Program, Authorized, Amount | $ |  | $ 20,000,000 |  |  |  |  |  |  |  |  |
Share Repurchase Program, Authorized, Percentage of Outstanding Shares |  | 25.00% |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ |  |  |  |  |  |  |  | $ 1,600,000 |  |  |
Common Class A [Member] | Boulderado and Magnolia [Member] |  |  |  |  |  |  |  |  |  |  |
Maximum Shares of Common Stock Registered by Certain Selling Shareholders (in shares) |  |  |  |  |  |  |  |  |  | 1,018,660 |
Treasury Stock, Shares, Acquired (in shares) |  |  |  | 522,231 |  |  |  |  |  |  |
Common Class B [Member] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |
Common Class B [Member] | Separation Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares (in shares) |  |  | 527,780 |  |  |  |  |  |  |  |
Sky Harbour Group Corporation Class A Common Stock [Member] | Boulderado [Member] | Separation Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Securities Repurchase Agreement, Equity Issued (in shares) |  |  | 194,738 |  |  |  |  |  |  |  |

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