Note 8 - Real Estate Development (Details Textual)				1 Months Ended	3 Months Ended
	Jan. 25, 2022 USD ($)	Apr. 15, 2020 USD ($) a	Apr. 07, 2020 USD ($) a	Apr. 30, 2021 USD ($) a	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Jul. 30, 2020 a	Jun. 16, 2020 a	Sep. 27, 2018 a
Area of Land (Acre) | a		2.4	11.3	7.4
Income (Loss) from Equity Method Investments					$ (239,522)	$ (637,704)
Investee Losses in Excess of Equity Investment					1,720,160		$ 1,205,068
Equity Method Investments					7,005,465		6,389,869
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					12,668,009		12,502,743
Proceeds from Sale of Land Held-for-investment		$ 1,100,000	$ 2,400,000	$ 1,200,000
State and Local Jurisdiction [Member]
Income Taxes Receivable, Noncurrent					12,668,000		12,503,000
Income Tax Receivable Principal					11,180,000		11,180,000
Income Tax Receivable Interest					1,488,000		1,323,000
Doran Canterbury II [Member]
Area of Land (Acre) | a								10		13
Equity Method Investment, Ownership Percentage								27.40%		27.40%
Income (Loss) from Equity Method Investments					515,000	647,000
Investee Losses in Excess of Equity Investment					1,720,000		$ 1,205,000
Equity Method Investments					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					$ 276,000	$ 10,000