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Note 12 - Stock Incentive Plan (Details Textual) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 10, 2023 shares | Dec. 03, 2022 shares | Nov. 19, 2021 shares | Nov. 05, 2020 shares | Nov. 04, 2019 shares | Jul. 31, 2014 shares | Nov. 30, 2021 shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares
Share-Based Payment Arrangement, Expense | $ |  |  |  |  |  |  |  | $ 1,083,414 | $ 951,385 | $ 182,324
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested Options Forfeited, Number of Shares (in shares) |  |  |  |  |  |  |  | 0 | 0 | 0
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ |  |  |  |  |  |  |  | $ 1,791,719 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  |  | 9 months 14 days |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  | 60,500 | 60,000 | 49,650
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Granted in Period, Fair Value | $ |  |  |  |  |  |  |  | $ 1,447,160 | $ 1,138,800 | $ 1,303,809
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value | $ |  |  |  |  |  |  |  | $ 1,282,185 | $ 978,025 | $ 663,347
The 2014 Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  | 75,000 | 225,000 |  |  |
Share Based Compensation Arrangement By Share Based Payment Awarded Term (Year) |  |  |  |  |  | 10 years | 10 years |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 17 Key Persons [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  | 15,444 |  |  |  |  |
Number of Key People Issued Awards |  |  |  |  | 17 |  |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 17 Key Persons [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  | 50.00% |  |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 17 Key Persons [Member] | Share-Based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  | 50.00% |  |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | Officers and Directors [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 31,000 | 31,000 | 27,700 | 27,100 | 8,713 |  |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | Eurobulk Employees [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 29,500 | 29,000 | 21,950 | 18,800 | 6,731 |  |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 16 Key Persons [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 45,900 |  |  |  |  |  |
Number of Key People Issued Awards |  |  |  | 16 |  |  |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 16 Key Persons [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 50.00% |  |  |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 16 Key Persons [Member] | Share-Based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 50.00% |  |  |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 21 Key Persons [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 49,650 |  |  |  |  |  |  |
Number of Key People Issued Awards |  |  | 21 |  |  |  |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 21 Key Persons [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 50.00% |  |  |  |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 21 Key Persons [Member] | Share-Based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 50.00% |  |  |  |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 31 Key Persons [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 60,000 |  |  |  |  |  |  |  |
Number of Key People Issued Awards |  | 31 |  |  |  |  |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 31 Key Persons [Member] | Share-Based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 50.00% |  |  |  |  |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 32 Key Persons [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 60,500 |  |  |  |  |  |  |  |  |
Number of Key People Issued Awards | 32 |  |  |  |  |  |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 32 Key Persons [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 50.00% | 50.00% |  |  |  |  |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 32 Key Persons [Member] | Share-Based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 50.00% |  |  |  |  |  |  |  |  |

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