Note 1 - Organization and Significant Accounting Policies (Details Textual)				3 Months Ended		6 Months Ended	12 Months Ended
	Dec. 27, 2021 USD ($) shares	Jun. 27, 2019 USD ($)	May 18, 2018 USD ($)	Mar. 31, 2022	Mar. 31, 2021 shares	Jun. 30, 2018	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020	Jun. 30, 2022 USD ($) shares	Aug. 24, 2017 USD ($)
Number of Reportable Segments				4
Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance		$ 0
Number of Vacant Properties				2
Financing Receivable, after Allowance for Credit Loss, Noncurrent, Total							$ 50,000		$ 50,000
Triad Guaranty, Inc. [Member]
Equity Method Investments			$ 55,000							$ 100,000
Percentage of Annual Interest Rate on Promissory Note			10.00%					12.00%
Percentage Rate of Issuance of Warrants			2.50%
Equity Securities, Number of Shares Received in Lieu of Interest Accrued (in shares) | shares					454,097
Financing Receivable, after Allowance for Credit Loss, Total	$ 155,000
Equity Securities Acquired, Shares (in shares) | shares	393,750
Payments to Acquire Notes Receivable	$ 25,000
Impairment Loss, Equity Securities and Note Receivable							189,515
Financing Receivable, after Allowance for Credit Loss, Noncurrent, Total							50,000		50,000
Equity Securities without Readily Determinable Fair Value, Amount							$ 0		$ 0
Investment Owned, Balance, Shares (in shares) | shares							847,847		847,847
Mt. Melrose LLC [Member] | Woodmont [Member]
Percentage of Membership Interest in Subsidiary Sold		65.00%
Mt. Melrose LLC [Member] | Residential Properties [Member]
Real Estate Property Bundles Acquired						2