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Note 1 - Basis of Presentation (Details Textual) - USD ($)		3 Months Ended			9 Months Ended
	Jul. 26, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Asset Impairment Charges, Total			$ 3,600,000
Proceeds from Sale of Buildings					$ 23,075,477	$ 0
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		$ 6,894,109		$ 0	$ 6,894,109	$ 0
The Premises at 555 N Research Place, Central Islip, NY [Member]
Proceeds from Sale of Buildings	$ 24,360,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	6,894,109
Proceeds from Sale of Buildings, Net	14,000,000
The Premises at 555 N Research Place, Central Islip, NY [Member] | HSBC Bank Second Mortgage Loan [Member]
Repayments of Debt	$ 9,352,719

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