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Note 11 - Capital Stock (Details Textual)			3 Months Ended	9 Months Ended		12 Months Ended
Note 11 - Capital Stock (Details Textual)	Jul. 23, 2024 USD ($)	May 09, 2024 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 08, 2022 USD ($)	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) \| shares								500,000,000
Maximum Shares of Common Stock Registered by Certain Selling Shareholders (in shares) \| shares								8,297,093
Proceeds from Issuance of Common Stock				$ 0	$ 37,526,663
Treasury Stock, Value, Acquired, Cost Method			$ 1,380,180
Class of Warrant or Right, Outstanding (in shares) \| shares			53,562	53,562		105,556
Payments for Repurchase of Equity				$ 18,141,551	$ (0)
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) \| shares		36,705
Deferred Compensation Arrangement with Individual, Shares Issued (in shares) \| 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
Separation Agreement [Member] \| Boulderado [Member]
Securities Repurchase Agreement, Consideration Transferred		9,951,113
Payments for Repurchase of Equity		$ 7,960,891
Warrants for Common Class B Stock [Member]
Class of Warrant or Right, Outstanding (in shares) \| shares			52,778	52,778
Warrants for Common Class B Stock [Member] \| Separation Agreement [Member]
Class of Warrant or Right, Repurchased During the Period (in shares) \| shares		51,994
Warrants for Common Class A Stock [Member]
Class of Warrant or Right, Outstanding (in shares) \| shares			784	784
Common Class A [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share) \| $ / shares			$ 1	$ 1		$ 1
Common Class A [Member] \| Separation Agreement [Member]
Stock Repurchased During Period, Shares (in shares) \| shares		210,000
Common Class B [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share) \| $ / shares			$ 0.001	$ 0.001		$ 0.001
Common Stock, Voting Rights Per Share			10	10
Common Class B [Member] \| Separation Agreement [Member]
Stock Repurchased During Period, Shares (in shares) \| shares		527,780
Sky Harbour Group Corporation Class A Common Stock [Member] \| Separation Agreement [Member] \| Boulderado [Member]
Securities Repurchase Agreement, Equity Issued (in shares) \| shares		194,738
At The Market Offering [Member] \| Common Class A [Member]
Stock Issued During Period, Shares, New Issues (in shares) \| shares						1,532,065
Proceeds from Issuance of Common Stock						$ 37,526,663
Commission, Percent of Gross Sales Price Per Share						3.00%
At The Market Offering [Member] \| Common Class A [Member] \| Maximum [Member]
Equity Offering Program, Aggregate Share Price			$ 100,000,000	$ 100,000,000			$ 100,000,000
Share Repurchase Program [Member] \| Common Class A [Member]
Share Repurchase Program, Authorized, Amount	$ 20,000,000
Share Repurchase Program, Authorized, Percentage of Outstanding Shares	25.00%
Treasury Stock, Shares, Acquired (in shares) \| shares			97,262
Treasury Stock, Value, Acquired, Cost Method			$ 1,380,180