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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, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Payments to Acquire Property, Plant, and Equipment, Total				$ 1,202,899	$ 2,115,733
Rental Income, Nonoperating			$ 175,000	395,000
Proceeds from Issuance of Long-term Debt, Total				$ 2,415,970
HSBC Bank Mortgage Loan [Member]
Debt Instrument, Number of Payments				120
Debt Instrument, Periodic Payment, Total				$ 25,000
Long-term Debt, Total			$ 2,100,000	$ 2,100,000		$ 2,400,000
Debt Instrument, Interest Rate, Stated Percentage			1.90%	1.90%		3.49%
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			$ 9,400,000	$ 9,400,000		$ 9,700,000
Debt Instrument, Interest Rate, Stated Percentage			3.9148%	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

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The number of payments for a debt instrument.

+ References

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-SubTopic 30
-Section 45
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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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