Note 2 - Liquidity and Material Agreements (Details Textual)									1 Months Ended		3 Months Ended							6 Months Ended	9 Months Ended			12 Months Ended
	May 01, 2021 USD ($)	Aug. 14, 2020 USD ($)	Oct. 11, 2018 USD ($)	Apr. 20, 2018 USD ($)	Jan. 01, 2017	Oct. 01, 2016	Jun. 01, 2016	Nov. 01, 2008 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 15, 2018	Dec. 31, 2020 USD ($)	Dec. 31, 2015	Apr. 30, 2028 USD ($)	Dec. 31, 2019 USD ($)	Jan. 15, 2019 USD ($)	Mar. 15, 2018 USD ($)	May 17, 2013 USD ($)
Cash and Cash Equivalents, at Carrying Value, Ending Balance											$ 2,010,293								$ 2,010,293
Working Capital											3,413,169								3,413,169
Revenue from Contract with Customer, Including Assessed Tax											1,451,817				$ 720,787				3,439,977	$ 2,833,174
Net Income (Loss) Attributable to Parent, Total											197,078	$ 577,164	$ (265,666)		$ 6,364	$ (754,935)	$ (96,140)		508,576	(844,711)
Net Cash Provided by (Used in) Operating Activities, Total																			444,389	(1,111,606)
Net Cash Provided by (Used in) Investing Activities, Total																			(78,044)	(4,912)
Net Cash Provided by (Used in) Financing Activities, Total																			(255,134)	(112,500)
Environmental Remediation, Agreed Percentage of Reduction in Tenant Operated Tourist Flights							20.00%
Environmental Remediation, Agreed Percentage of Reduction in Tenant Operated Tourist Flights by Year One						40.00%
Environmental Remediation, Agreed Percentage of Reduction in Tenant Operated Tourist Flights by Year Two					50.00%
General and Administrative Expense, Total																			0	144,000
Concession Fees																			$ 103,810	$ 254,000
Financing Receivable, after Allowance for Credit Loss, Total																										$ 276,000
Financing Receivable, Interest Rate																										7.50%
Financing Receivable, Allowance for Credit Loss, Writeoff														$ 205,000								$ 205,000
Warren A. Peck [Member]
Proceeds from Collection of Notes Receivable									$ 100,000	$ 100,000
Financing Receivable, after Allowance for Credit Loss, Current, Total																									$ 270,000
Truck Lease [Member]
Lessee, Finance Lease, Term of Contract (Month)				60 months
Lessee, Finance Lease, Base Lease Payment				$ 2,568
Capital Lease, Lessee, Purchase Price of Capital Leased Asset				$ 1.00
Concession Agreement [Member]
Percentage Payable Greater than Gross Receipts During Period								18.00%											18.00%
Amount of Gross Receipts During Period								$ 5,000,000											$ 100,000
Percentage Payable Greater than Gross Receipts in Year One								25.00%
Minimum Annual Guarantee Percent					50.00%
Line of Credit Facility, Payment Term (Month)																							30 months
Line of Credit Facility, Number of Options to Extend Agreement																							2
Paycheck Protection Program CARES Act [Member]
Proceeds from Issuance of Long-term Debt, Total		$ 304,833
Truck Note [Member]
Debt Instrument, Face Amount	$ 76,000
Debt Instrument, Number of Annual Payments	6
Debt Instrument, Periodic Payment, Interest	$ 13,432.56
Debt Instrument Interest Rate, Per Gallon																								$ 0.018
London Interbank Offered Rate (LIBOR) [Member] | Truck Lease [Member]
Capital Leases of Lessee, Contingent Rentals, Basis Spread on Variable Rate				4.16%
Prime Rate [Member] | Truck Note [Member]
Debt Instrument, Basis Spread on Variable Rate	3.00%
Key Bank National Association [Member] | Term Loan [Member]
Debt Instrument, Face Amount																											$ 338,481
Long-term Debt, Current Maturities, Total											$ 0								0
Acquisition Line of Credit [Member] | Key Bank National Association [Member]
Line of Credit Facility, Maximum Borrowing Capacity																											2,500,000
Debt Instrument, Term (Month)																					48 months
Debt Instrument, Periodic Payment, Total																			$ 0
Acquisition Line of Credit [Member] | Key Bank National Association [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate																					2.75%
Acquisition Line of Credit [Member] | Key Bank National Association [Member] | Cost of Funds Rate [Member]
Debt Instrument, Basis Spread on Variable Rate																			2.50%
Working Capital Line of Credit [Member] | Key Bank National Association [Member]
Line of Credit Facility, Maximum Borrowing Capacity																											$ 1,000,000
Debt Instrument, Periodic Payment, Total																			$ 0
Working Capital Line of Credit [Member] | Key Bank National Association [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate																			2.75%
PNC Acquisition Line [Member]
Line of Credit Facility, Maximum Borrowing Capacity																												$ 2,500,000
Change of Terms Agreement [Member] | Key Bank National Association [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 2,500,000
Debt Instrument, Periodic Payment, Total																		$ 0
Change of Terms Agreement [Member] | Key Bank National Association [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			4.25%