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Note 1 - Basis of Presentation (Details Textual) - USD ($)	3 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Mar. 31, 2021
Asset Impairment Charges, Total		$ 3,600,000
HSBC Bank Second Mortgage Loan [Member]
Secured Debt, Total			$ 9,200,000
The Premises at 555 N Research Place, Central Islip, NY [Member] | Forecast [Member]
Proceeds from Sale of Buildings	$ 24,360,000

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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