Note 8 - Real Estate Development (Details Textual)		3 Months Ended
	Jan. 25, 2022 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 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
Income (Loss) from Equity Method Investments		$ 1,858,512	$ (239,522)
Investee Losses in Excess of Equity Investment		1,304,179		$ 3,185,923
Payments to Acquire Equity Method Investments		(0)	340,026
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		13,499,248		13,294,337
State and Local Jurisdiction [Member]
Income Taxes Receivable, Noncurrent		13,499,000		13,294,000
Income Tax Receivable Principal		11,341,000		11,301,000
Income Tax Receivable Interest		2,158,000		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		1,882,000	(515,000)
Investee Losses in Excess of Equity Investment		1,304,000		$ 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	340,000
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		$ 25,000	$ 276,000