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Note 7 - Long-term Debt (Details Textual)			3 Months Ended		9 Months Ended
	Apr. 21, 2020 USD ($)	Nov. 30, 2017 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Payments to Acquire Property, Plant, and Equipment, Total					$ 212,920	$ 1,202,899
Proceeds from Issuance of Long-term Debt, Total					0	2,415,970
Gain (Loss) on Extinguishment of Debt, Total			$ 0	$ 0	$ 2,443,418	$ 0
HSBC Bank Mortgage Loan [Member]
Debt Instrument, Number of Payments					120
Debt Instrument, Periodic Payment, Total					$ 25,000
Long-term Debt, Total			$ 1,800,000		$ 1,800,000		$ 2,100,000
Debt Instrument, Interest Rate, Stated Percentage			1.85%		1.85%		1.89%
HSBC Bank Mortgage Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate					1.75%
HSBC Bank Mortgage Loan [Member] | Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate					0.50%
HSBC Bank Second Mortgage Loan [Member]
Debt Instrument, Face Amount		$ 10,387,500
HSBC Bank Second Mortgage Loan [Member] | Premises at 555 North Research Place, Central Islip, NY [Member]
Payments to Acquire Property, Plant, and Equipment, Total		$ 13,850,000
Paycheck Protection Program CARES Act [Member]
Proceeds from Issuance of Long-term Debt, Total	$ 2,415,970
Gain (Loss) on Extinguishment of Debt, Total					$ 2,443,418

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The number of payments for a debt instrument.

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