Note 8 - Real Estate Development (Details Textual)				1 Months Ended	3 Months Ended		6 Months Ended
	May 20, 2022 USD ($) a	Jan. 25, 2022 USD ($)	Apr. 07, 2020 USD ($) a	Apr. 30, 2021 USD ($) a	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Jul. 30, 2020 a	Jun. 16, 2020 a	Sep. 27, 2018 a
Area of Land (Acre) | a	4		11.3	7.4
Income (Loss) from Equity Method Investments					$ (534,393)	$ (640,876)	$ (773,915)	$ (1,278,580)
Investee Losses in Excess of Equity Investment					2,216,982		2,216,982		$ 1,205,068
TIF Improvement Costs					23,336,500		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					12,835,112		12,835,112		12,502,743
Proceeds from Sale of Land Held-for-investment	$ 1,200,000		$ 2,400,000	$ 1,200,000
State and Local Jurisdiction [Member]
Income Taxes Receivable, Noncurrent					12,835,000		12,835,000		12,503,000
Income Tax Receivable Principal					11,180,000		11,180,000		11,180,000
Income Tax Receivable Interest					1,655,000		1,655,000		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					497,000	$ 639,000	1,012,000	$ 1,286,000
Investee Losses in Excess of Equity Investment					2,217,000		2,217,000		$ 1,205,000
Equity Method Investments Contributions					58,000		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					$ (37,000)		$ 239,000