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Note 6 - Loans Payable (Details Textual)							1 Months Ended	4 Months Ended	12 Months Ended
	Mar. 20, 2021 USD ($)	Jan. 28, 2021 USD ($)	Jul. 16, 2020 USD ($) a	Mar. 29, 2019 USD ($)	Jan. 24, 2019 USD ($)	Mar. 21, 2018 USD ($)	Jan. 31, 2021 USD ($)	Jul. 16, 2020 USD ($) a	Dec. 31, 2020 USD ($) ft² a	Dec. 31, 2019 USD ($)
Cortlandt Manor Medical Center [Member]
Area of Real Estate Property (Square Foot) | ft²									34,000
Real Estate Securing Mortgage Loan [Member] | Flowerfield Industrial Park [Member]
Area of Real Estate Property (Square Foot) | a			31.8					31.8	31.8
Real Estate Securing Mortgage Loan [Member] | Cortlandt Manor Medical Center [Member]
Area of Real Estate Property (Square Foot) | a			13.8					13.8
Non-revolving Credit Line [Member]
Line of Credit Facility, Maximum Borrowing Capacity					$ 3,000,000	$ 3,000,000
Debt Instrument, Interest Only Phase, Term (Month)						240 days
Debt Instrument, Interest and Principal Phase, Term (Month)					7 years
Proceeds from Lines of Credit, Total				$ 1,100,000	$ 1,100,000
Non-revolving Credit Line [Member] | Interest Only Period of Payments [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate					4.75%
Non-revolving Credit Line [Member] | Prime Rate [Member] | Interest Only Period of Payments [Member]
Debt Instrument, Basis Spread on Variable Rate					1.50%
Non-revolving Credit Line [Member] | Federal Home Loan Bank Rate [Member] | After Interest Only Payment Period [Member]
Debt Instrument, Basis Spread on Variable Rate					2.00%
Debt Instrument, Amortization Period (Year)					20 years
Debt Instrument, Interest Rate, Effective Percentage					3.85%
Non-revolving Credit Line [Member] | Federal Home Loan Bank Rate [Member] | After Interest Only Payment Period [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate					3.85%
Non-revolving Credit Line 2 [Member]
Line of Credit Facility, Maximum Borrowing Capacity					$ 3,000,000
Debt Instrument, Interest Only Phase, Term (Month)					2 years
Debt Instrument, Interest and Principal Phase, Term (Month)					7 years
Proceeds from Lines of Credit, Total									$ 1,000,000	$ 1,580,068
Non-revolving Credit Line 2 [Member] | Subsequent Event [Member]
Proceeds from Lines of Credit, Total							$ 419,932
Non-revolving Credit Line 2 [Member] | After Interest Only Payment Period [Member]
Debt Instrument, Amortization Period (Year)					20 years
Debt Instrument, Interest Rate, Effective Percentage					3.85%
Non-revolving Credit Line 2 [Member] | Prime Rate [Member] | Interest Only Period of Payments [Member]
Debt Instrument, Basis Spread on Variable Rate					1.00%
Non-revolving Credit Line 2 [Member] | Prime Rate [Member] | Interest Only Period of Payments [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate					4.75%
Non-revolving Credit Line 2 [Member] | Federal Home Loan Bank Rate [Member] | After Interest Only Payment Period [Member]
Debt Instrument, Basis Spread on Variable Rate					2.00%
Non-revolving Credit Line 2 [Member] | Federal Home Loan Bank Rate [Member] | After Interest Only Payment Period [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate					3.85%
Non-revolving Credit Line 3 [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 2,500,000					$ 2,500,000
Debt Instrument, Interest Only Phase, Term (Month)								2 years
Proceeds from Lines of Credit, Total			$ 379,765
Line of Credit Facility, Remaining Borrowing Capacity									$ 1,450,000
Non-revolving Credit Line 3 [Member] | Subsequent Event [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 3,000,000
Debt Instrument, Interest and Principal Phase, Term (Month)	7 years
Proceeds from Lines of Credit, Total		$ 670,235
Non-revolving Credit Line 3 [Member] | Interest Only Period of Payments [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Effective Percentage			4.75%					4.75%
Non-revolving Credit Line 3 [Member] | Prime Rate [Member] | Interest Only Period of Payments [Member]
Debt Instrument, Basis Spread on Variable Rate								1.00%

X

- Definition

The amortization period of the debt instrument.

+ References

No definition available.

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- Definition

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+ References

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+ References

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- Definition

Area of a real estate property.

+ References

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- Definition

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+ References

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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