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Note 9 - Long-term Bank Loans (Details Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 7 Months Ended | 12 Months Ended
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Jul. 13, 2023 USD ($) | Jun. 29, 2023 USD ($) | Mar. 31, 2023 USD ($) | Feb. 06, 2023 USD ($) | Sep. 13, 2022 USD ($) | Dec. 14, 2021 USD ($) | Nov. 26, 2021 USD ($) | Oct. 22, 2021 USD ($) | Sep. 06, 2021 USD ($) | Jun. 26, 2020 USD ($) | Nov. 08, 2019 USD ($) | Jul. 30, 2019 USD ($) | May 30, 2019 USD ($) | May 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2019 | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Long-Term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 131,000,000 | $ 107,975,000 |
Restricted Cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,702,994 | 5,593,173 |
Interest Expense, Operating and Nonoperating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,955,496 | 4,729,759 | $ 2,556,237
Interest Costs Capitalized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,410,933 | 544,639 |
Term Sheet, Piraeus S.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid |  | 20,000,000 |  |  |  |  |  | $ 4,340,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  | $ 1,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 16,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Number of Quarterly Payments |  | 16 |  |  |  |  |  | 16 |  |  |  |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 115,000
Long-Term Debt, Gross |  | $ 28,380,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Security Cover Ratio |  | 125.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Sheet, Piraeus S.A., First Four Installments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Term Sheet, Piraeus S.A., Eleven Installments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  |  |  |  |  |  | $ 560,000 |  |  |  |  |  |  |  |  |  |  |  |
Jonathan John Shipping Ltd., and Corfu Navigation Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  |  |  |  |  |  |  | $ 225,000 |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Gross | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,500,000 | 7,500,000 |
Debt Instrument, Covenant, Security Cover Ratio |  |  |  |  |  |  |  |  |  | 120.00% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Number of Payments |  |  |  |  |  |  |  |  |  | 16 |  |  |  |  |  |  |  |  |  |
Jonathan John Shipping Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 3,500,000 |  |  |  |  |  |  |  |  |  |
Corfu Navigation Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 6,500,000 |  |  |  |  |  |  |  |  |  |
Term Loan, HSBC Bank plc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid |  |  |  |  |  | $ 9,250,000 |  |  | $ 1,800,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  |  |  |  | 1,000,000 |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 19,250,000 |  |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Number of Quarterly Payments |  |  |  |  |  | 10 |  |  | 12 |  |  |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  |  |  |  |  |  | $ 117,500 |  |  |  |  |  |  |  |  |  | $ 115,500 |
Debt Instrument, Covenant, Security Cover Ratio |  |  |  |  |  | 130.00% |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |
Term Loan With Eurobank Ergasias S.A. by Marcos Shipping Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid |  |  |  |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 34,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Number of Quarterly Payments |  |  |  |  |  |  | 16 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Security Cover Ratio |  |  |  |  |  |  | 120.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan With Eurobank Ergasias S.A. by Marcos Shipping Ltd., Twelve Installments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan With Eurobank Ergasias S.A. by Marcos Shipping Ltd., Four Installments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Term Sheet With Major Commercial Banking Institution [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid |  |  |  | $ 10,400,000 |  |  |  |  |  |  |  |  |  |  |  | $ 10,400,000 |  |  |  |
Payments of Debt Issuance Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 221,000 |  |
Debt Instrument, Covenant, Security Cover Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120.00% |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 26,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 26,000,000 |  |  |  |
Line of Credit Facility, Maximum Borrowing Amount, Percent of the Vessel's Market Value for Financing |  |  |  | 67.00% |  |  |  |  |  |  |  |  |  |  |  | 67.00% |  |  |  |
Proceeds from Issuance of Debt |  |  |  | $ 26,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Number of Consecutive Quarterly Installments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28 |  |  |  |
Loan Payable, Twelve Quarterly Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 |  |  |  |
Loan Payable, Sixteen Quarterly Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 450,000 |  |  |  |
Term Sheet With National Bank of Greece S.A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid |  |  | $ 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 26,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Number of Quarterly Payments |  |  | 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  | $ 260,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Security Cover Ratio |  |  | 125.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) [Member] | Term Sheet, Piraeus S.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  | 2.60% |  |  |  |  |  |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) [Member] | Jonathan John Shipping Ltd., and Corfu Navigation Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) [Member] | Term Loan, HSBC Bank plc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 1.95% |  |  | 2.35% |  |  |  |  |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) [Member] | Term Loan With Eurobank Ergasias S.A. by Marcos Shipping Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  | 2.80% |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) [Member] | Term Sheet With Major Commercial Banking Institution [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.15% |  |  |  |
Secured Overnight Financing Rate (SOFR) [Member] | Term Sheet With National Bank of Greece S.A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Equivalent to Deposits [Member] | Secured Overnight Financing Rate (SOFR) [Member] | Term Sheet, Piraeus S.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Exceeding Deposit Amount [Member] | Secured Overnight Financing Rate (SOFR) [Member] | Term Sheet, Piraeus S.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Twelve Installments [Member] | Term Sheet With National Bank of Greece S.A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Second Twelve Installments [Member] | Term Sheet With National Bank of Greece S.A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eurobank Ergasias S.A. [Member] | Corfu Navigation Ltd., Jonathan John Shipping Ltd. and Bridge Shipping Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt, Refinanced, Amount |  |  |  |  |  |  |  |  |  | $ 5,525,000 |  |  |  |  |  |  |  |  |  |
Eurobank Ergasias S.A. [Member] | Revolving Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,000,000 |  |  |  |  |  |
Debt Instrument, Number of Periodic Payments |  |  |  |  |  |  |  |  |  |  |  |  |  | 16 |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 375,000 |  |  |  |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid |  |  |  |  |  |  |  |  |  |  | $ 7,125,000 |  |  | $ 6,000,000 |  |  |  |  |  |
Debt Instrument, Deferred Amount |  |  |  |  |  |  |  |  |  |  | $ 1,125,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Number of Periodic Payments, Deferred |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Repayments of Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,500,000 |  |  |  |  |
Eurobank Ergasias S.A. [Member] | Revolving Loan Facility [Member] | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.90% |  |  |
HSBC Bank PLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,500,000 |  |  |  |  |  |  |
Debt Instrument, Number of Periodic Payments |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,200,000 |  |  |  |  |  |  |
Repayments of Long-Term Debt |  |  |  |  | $ 6,650,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  |  |  |  |  |  |  |  |  |  |  | $ 450,000 |  |  |  |  |  |  |
HSBC Bank PLC [Member] | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  | 2.95% |  |  |  |  |  |  |
Piraeus Bank S.A. [Member] | Second Debt Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  |  | $ 32,000,000 |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid |  |  |  |  |  |  |  |  |  |  |  | $ 17,400,000 |  |  |  |  |  |  |  |
Piraeus Bank S.A. [Member] | Second Debt Agreement, First Payments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Number of Periodic Payments |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |  |  |  |  |  |  |
Piraeus Bank S.A. [Member] | Second Debt Agreement, Second Payments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Number of Periodic Payments |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  |  |  |  |  |  |  |  |  |  | $ 800,000 |  |  |  |  |  |  |  |
Piraeus Bank S.A. [Member] | Secured Overnight Financing Rate (SOFR) [Member] | Second Debt Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  | 3.50% |  |  |  |  |  |  |  |
[1] | On September 6, 2021, the Company signed a term loan facility with Sinopac Capital International (HK) Limited (“Sinopac”) for an amount of up to $10,000,000, in order to refinance the existing indebtedness of M/V “Aegean Express” and M/V “EM Corfu”, amounting to $5,525,000 as of the date of refinancing, and for working capital purposes. The facility was available in two advances. Both advances of $3,500,000 and $6,500,000 were drawn on September 9, 2021 by Jonathan John Shipping Ltd. and Corfu Navigation Ltd. as the borrowers. The loan is payable in sixteen consecutive quarterly installments of $500,000 each, followed by a balloon payment of $2,000,000 to be paid together with the last installment in September 2025. The loan bears interest at SOFR plus a margin of 3.50%. The loan is secured with the following: (i) first priority mortgages over M/V “Aegean Express” and M/V “EM Corfu”, (ii) first assignment of earnings and insurance of the abovementioned vessels and (iii) other covenants and guarantees similar to the remaining loans of the Company. The security cover ratio covenant for this facility stands at 120%. The Company paid loan arrangement fees of $225,000 within 2021 for this loan.

X
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- Definition The percent of market value of vessel for financing that is the maximum borrowing amount for a line of credit facility. + References No definition available. + Details
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- Definition Represents twelve quarterly instruments for loan payable. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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