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Note 7 - Real Estate - Real Estate Disclosure (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Net Realizable Value at beginning of period | $ 36,201,270 | $ 33,016,665
Increase (decrease) in net realizable value | 12,068,730 | 3,984,605
Net Realizable Value at December 31, | 48,270,000 | 36,201,270
Cortlandt Manor Medical Center [Member] |  |
Increase (decrease) in net realizable value | 2,010,000 | 1,040,000
Flowerfield Properties, Inc. [Member] |  |
Increase (decrease) in net realizable value | 10,058,730 | 2,944,605
Port Jefferson Professional Park [Member] |  |
Increase (decrease) in net realizable value |  | $ (800,000)
Net Realizable Value at December 31, | $ 48,270,000 |

X
- Definition Amount of increase (decrease) before accumulated depreciation of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Details
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- Details
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X
- Details
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