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Note 11 - Concentration of Credit Risk	12 Months Ended
	Dec. 31, 2020
Credit Concentration Risk [Member]
Notes to Financial Statements
Concentration Risk Disclosure [Text Block]	11. Concentration of Credit Risk Financial instruments, which potentially subject the Company to concentrations of credit risk, consist principally of cash and cash equivalents. The Company places its temporary cash investments with high credit quality financial institutions and generally limits the amount of credit exposure in any one financial institution. The Company maintains bank account balances, which exceed insured limits. The Company has not experienced any losses in such accounts and believes that it is not exposed to any significant credit risk on cash. Management does not believe significant credit risk existed on December 31, 2020 and 2019. As the Company executes on the sale of its assets, its regional concentration in tenants will lessen thereby resulting in the increased credit risk from exposure of the local economies. For the year ended December 31, 2020 rental income from the Company's three largest tenants represented approximately 24%, 21% and 9% of total rental income. The three largest tenants by revenue as of December 31, 2020 consist of a state agency located in the industrial park, a medical tenant in the Cortlandt Manor Medical Center and a tenant in the industrial park that previously expanded its space. The current economic challenges facing state and local budgets impacted most of the Company's largest tenants. In addition, the current economic challenges stemming from the coronavirus are disproportionately impacting not -for-profit tenants and tenants that are neither medical offices nor part of or affiliated with SBU or SBU Hospital which together comprise 37% of our expected 2021 rental revenue. There can be no assurance that the Company's leases will renew for the same square footage, at favorable rates net of tenant improvements, if at all.

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- Definition

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-URI http://asc.fasb.org/topic&trid=2134479

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