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Note 7 - Long-term Debt - Summary of Long-term Debt (Details) (Parentheticals) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Loan [Member] |  |
Monthly Installments | $ 62,481 | $ 62,481
Interest Rate | 3.9148% | 3.9148%
Debt Instrument, face amount | $ 10,387,500 | $ 10,387,500
Paycheck Protection Program CARES Act [Member] |  |
Interest Rate |  | 1.00%
Debt Instrument, face amount |  | $ 2,415,970
HSBC Bank Mortgage Loan [Member] |  |
Monthly Installments | $ 25,000 | $ 25,000
Interest Rate | 1.86% | 1.89%
Debt Instrument, face amount | $ 6,000,000 | $ 6,000,000
HSBC Bank Mortgage Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Interest Rate | 1.75% | 1.75%
HSBC Bank Mortgage Loan [Member] | Prime Rate [Member] |  |
Interest Rate | 0.50% | 0.50%

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