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Note 16 - Subsequent Events (Details Textual)				12 Months Ended
	Mar. 26, 2020 USD ($) a	Feb. 27, 2020	Feb. 21, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 ft² a
Cortlandt Manor Medical Center [Member]
Area of Real Estate Property | ft²					34,000
Real Estate Securing Mortgage Loan [Member] | Flowerfield Industrial Park [Member]
Area of Real Estate Property | a					31.8
Subsequent Event [Member] | National Mortgage Banking Firm [Member]
Debt Instrument, Origination Fee, Percentage		1.00%
Subsequent Event [Member] | Real Estate Securing Mortgage Loan [Member] | Cortlandt Manor Medical Center [Member]
Area of Real Estate Property | a	14
Non-revolving Credit Line 3 [Member] | Subsequent Event [Member]
Line of Credit Facility, Maximum Borrowing Capacity | $	$ 2,500,000		$ 3,000,000
Debt Instrument, Interest and Principal Phase, Term			7 years
Debt Instrument, Interest Only Phase, Term	2 years
Non-revolving Credit Line 3 [Member] | Subsequent Event [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Effective Percentage	4.00%
Non-revolving Credit Line 3 [Member] | Subsequent Event [Member] | After Interest Only Payment Period [Member]
Debt Instrument, Basis Spread on Variable Rate	0.0475%
Non-revolving Credit Line 3 [Member] | Subsequent Event [Member] | Prime Rate [Member] | After Interest Only Payment Period [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Forecast [Member] | Small Businesses and Not-for-Profit Corporations [Member]
Operating Lease, Lease Income, Total | $				$ 834,000
Forecast [Member] | Customer Concentration Risk [Member] | Rental Income [Member] | Small Businesses and Not-for-Profit Corporations [Member]
Concentration Risk, Percentage				39.00%

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The debt instrument term for the phase of interest and principal payments.

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Area of a real estate property.

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

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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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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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