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v3.20.1

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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