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Note 8 - Asset and Liabilities Held for Sale (Details Textual) - USD ($)	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Disposal Group, Including Discontinued Operation, Assets, Current, Total		$ 16,181,368
Disposal Group, Including Discontinued Operation, Liabilities, Current, Total		9,218,683
The Premises at 555 N Research Place, Central Islip, NY [Member]
Disposal Group, Including Discontinued Operation, Assets, Current, Total		16,200,000
Disposal Group, Including Discontinued Operation, Liabilities, Current, Total		9,200,000
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

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Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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