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Note 1 - The Company (Details Textual)		12 Months Ended
	Sep. 01, 2015 USD ($)	Dec. 31, 2020 USD ($) ft² a
St. James, New York [Member] | Controlled by Parent Company [Member]
Area of Land (Acre)		68
Multi-Tenant Industrial Park [Member]
Area of Real Estate Property (Square Foot)		10
Flowerfield Industrial Park [Member]
Area of Real Estate Property (Square Foot) | ft²		127,000
Flowerfield Complex in Smithtown, New York [Member]
Area of Real Estate Property (Square Foot)		63
Zoned Residential, and Non-contiguous to the Flowerfield Property [Member]
Area of Land (Acre)		5
Cortlandt Manor Medical Center [Member]
Area of Land (Acre)		13.8
Area of Real Estate Property (Square Foot) | ft²		34,000
The Corporation [Member]
Maximum Value of Asset to Effect Dissolution | $	$ 1,000,000	$ 1,000,000

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- Definition

The maximum value where in the Amended and restated limited liability company agreement may effect dissolution upon the majority common interest or boards discretion.

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- Definition

Area of land held.

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- Definition

Area of a real estate property.

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