Note 8 - Asset and Liabilities Held for Sale (Details Textual) - USD ($)	Jul. 26, 2021	Jun. 30, 2021	Dec. 31, 2020
Disposal Group, Including Discontinued Operation, Assets, Current, Total		$ 16,181,368	$ 0
Disposal Group, Including Discontinued Operation, Liabilities, Current, Total		9,123,151	$ 0
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		9,100,000
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		$ 9,100,000
The Premises at 555 N Research Place, Central Islip, NY [Member] | Subsequent Event [Member]
Proceeds from Sale of Buildings	$ 24,360,000
The Premises at 555 N Research Place, Central Islip, NY [Member] | Subsequent Event [Member] | HSBC Bank Second Mortgage Loan [Member]
Repayments of Debt	$ 9,352,719