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Note 9 - Long-term Bank Loans (Details Textual)
 1 Months Ended 7 Months Ended 12 Months Ended
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.