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Note 7 - Long-term Debt - Summary of Long-term Debt (Details) (Parentheticals) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Loan [Member] |  |
Debt Instrument, face amount | $ 10,387,500 | $ 10,387,500
Monthly Installments | $ 62,481 | $ 62,481
Interest Rate | 3.9148% | 3.9148%
Paycheck Protection Program CARES Act [Member] |  |
Debt Instrument, face amount | $ 2,415,970 |
Interest Rate | 1.00% |
HSBC Bank Mortgage Loan [Member] |  |
Debt Instrument, face amount | $ 6,000,000 | $ 6,000,000
Monthly Installments | $ 25,000 | $ 25,000
Interest Rate | 1.89% | 3.49%
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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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of the required periodic payments including both interest and principal payments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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