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Note 7 - Long-term Debt (Details Textual)			3 Months Ended		12 Months Ended
	Apr. 21, 2020 USD ($)	Nov. 30, 2017 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Payments to Acquire Property, Plant, and Equipment, Total			$ 26,744	$ 422,435
HSBC Bank Mortgage Loan [Member]
Debt Instrument, Number of Payments					120
Debt Instrument, Periodic Payment, Total					$ 25,000
Long-term Debt, Total			$ 2,000,000		$ 2,100,000
Debt Instrument, Interest Rate, Stated Percentage			1.86%		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, Number of Payments					60
Debt Instrument, Periodic Payment, Total					$ 62,481
Long-term Debt, Total			$ 9,200,000		$ 9,300,000
Debt Instrument, Interest Rate, Stated Percentage					3.9148%
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

X

- Definition

The number of payments for a debt instrument.

+ References

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Face (par) amount of debt instrument at time of issuance.

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-SubTopic 30
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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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