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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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