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Note 19 - Subsequent Events (Details Textual) |  |  |  |  |  |  | 1 Months Ended
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Apr. 22, 2024 USD ($) | Apr. 19, 2024 USD ($) | Apr. 18, 2024 USD ($) | Mar. 27, 2024 USD ($) | Jan. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2023 USD ($)
Term Sheet With Major Commercial Banking Institution [Member] |  |  |  |  |  |  |
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
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid |  |  |  |  |  | $ 10,400,000 | $ 10,400,000
Term Sheet With Major Commercial Banking Institution [Member] | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  | 2.15%
Term Sheet With Major Commercial Banking Institution [Member] | Forecast [Member] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 45,000,000 |  | $ 22,000,000 |  |  |  |
Line of Credit Facility, Maximum Borrowing Amount, Percent of the Vessel's Market Value for Financing |  |  | 55.00% |  |  |  |
Proceeds from Issuance of Debt |  | $ 22,000,000 |  |  |  |  |
Debt Instrument, Number of Consecutive Quarterly Installments | 40 |  | 20 |  |  |  |
Debt Instrument, Periodic Payment, Total | $ 562,500 |  | $ 300,000 |  |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid | $ 22,500,000 |  | $ 16,000,000 |  |  |  |
Term Sheet With Major Commercial Banking Institution [Member] | Forecast [Member] | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.95% |  | 2.10% |  |  |  |
M/V “Tender Soul” [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment, Total |  |  |  |  | $ 27,000,000 |  |
M/V EM Astoria [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment, Total |  |  |  | $ 10,000,000 |  |  |
Gain (Loss) on Disposition of Property Plant Equipment, Total |  |  |  | $ 6,000,000 |  |  |

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