Note 8 - Real Estate Development (Details Textual)			3 Months Ended			6 Months Ended
	Apr. 28, 2023 USD ($) a	Jan. 25, 2022 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2020 a	Jul. 01, 2020	Jun. 16, 2020 a	Sep. 27, 2018 a
Area of Land (Acre) | a	37
Income (Loss) from Equity Method Investments			$ (622,180)	$ 1,858,512	$ (534,393)	$ 1,236,332	$ (773,915)
Investee Losses in Excess of Equity Investment			1,900,288			1,900,288		$ 3,185,923
Payments to Acquire Equity Method Investments						(0)	397,807
TIF Improvement Costs									$ 23,336,500
Estimated Cost of Tax Increment Financing Eligible Improvements, Expected Reduction		$ 5,744,000
Estimated Cost of Tax Increment Financing Eligible Improvements, Maximum Principle		$ 17,592,881
Income Taxes Receivable, Noncurrent			13,630,867			13,630,867		13,294,337
Escrow Deposit Disbursements Related to Property Acquisition	$ 500,000
Land [Member]
Sale of Land, Amount	$ 8,800,000
State and Local Jurisdiction [Member]
Income Taxes Receivable, Noncurrent			13,631,000			13,631,000		13,294,000
Income Tax Receivable Principal			11,305,000			11,305,000		11,301,000
Income Tax Receivable Interest			2,326,000			2,326,000		1,993,000
Doran Canterbury I Joint Venture [Member]
Area of Land (Acre) | a													13
Equity Method Investment, Ownership Percentage													27.40%
Income (Loss) from Equity Method Investments			(596,000)		(497,000)	1,286,000	(1,012,000)
Investee Losses in Excess of Equity Investment			1,900,000			1,900,000		$ 3,186,000
Doran Canterbury II [Member]
Area of Land (Acre) | a										10
Equity Method Investment, Ownership Percentage										27.40%
Payments to Acquire Equity Method Investments			0		58,000	0	398,000
Doran Canterbury II [Member] | Doran Canterbury II, LLC [Member]
Equity Method Investment, Ownership Percentage										72.60%
Canterbury DBSV [Member]
Area of Land (Acre) | a												13
Equity Method Investment, Ownership Percentage											61.87%
Income (Loss) from Equity Method Investments			$ (26,000)		$ (37,000)	$ (52,000)	$ 239,000