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Note 8 - Long-term Debt (Details Textual)			1 Months Ended	12 Months Ended
	Apr. 21, 2020 USD ($)	Nov. 30, 2017 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Payments to Acquire Property, Plant, and Equipment, Total				$ 665,000	$ 236,000
Gain (Loss) on Extinguishment of Debt, Total				0	$ 2,443,000
Loan Agreement to Fund Machinery Acquisition [Member]
Debt Instrument, Face Amount			$ 432,000
Debt Instrument, Number of Payments			60
Debt Instrument, Periodic Payment, Total			$ 8,352	$ 8,000
Debt Instrument, Interest Rate, Stated Percentage			6.00%	6.00%
Debt Instrument, Interest Rate, Stated Percentage			(6.00%)	(6.00%)
HSBC Bank Mortgage Loan [Member]
Debt Instrument, Number of Payments					120
Debt Instrument, Periodic Payment, Total					$ 25,000
Debt Instrument, Interest Rate, Stated Percentage					1.86%
Debt Instrument, Interest Rate, Stated Percentage					(1.86%)
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		$ 10,400,000
Debt Instrument, Number of Payments		60
Debt Instrument, Periodic Payment, Total		$ 62,481
Debt Instrument, Interest Rate, Stated Percentage		3.92%
Debt Instrument, Interest Rate, Stated Percentage		(3.92%)
HSBC Bank Second Mortgage Loan [Member] | Premises at 555 North Research Place, Central Islip, NY [Member]
Payments to Acquire Property, Plant, and Equipment, Total		$ 13,900,000
Paycheck Protection Program CARES Act [Member]
Proceeds from Issuance of Long-Term Debt, Total	$ 2,400,000
Gain (Loss) on Extinguishment of Debt, Total					$ 2,400,000

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The number of payments for a debt instrument.

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