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Note 7 - Long-term Debt (Details Textual) |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 21, 2020 USD ($) | Nov. 30, 2017 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Long-term Debt, Total |  |  | $ 13,796,724 |
Payments to Acquire Property, Plant, and Equipment, Total |  |  | 1,577,175 | $ 2,688,231
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 | 25,000
Long-term Debt, Total |  |  | $ 2,100,000 | $ 2,400,000
Debt Instrument, Interest Rate, Stated Percentage |  |  | 1.89% | 3.49%
Debt Instrument, Face Amount |  |  | $ 6,000,000 | $ 6,000,000
HSBC Bank Mortgage Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.75% |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 1.75% | 1.75%
HSBC Bank Mortgage Loan [Member] | Prime Rate [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.50% |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 0.50% | 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 |  |  | $ 9,300,000 | $ 9,700,000
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] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 1.00% |
Debt Instrument, Face Amount |  |  | $ 2,415,970 |
Proceeds from Issuance of Long-term Debt, Total | $ 2,415,970 |  |  |

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