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Note 11 - Stock Incentive Plan (Details Textual) |  |  |  |  | 12 Months Ended
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Nov. 04, 2019 shares | Nov. 21, 2018 shares | Nov. 02, 2017 shares | Jul. 31, 2014 shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) $ / shares shares
Share-based Payment Arrangement, Expense | $ |  |  |  |  | $ 97,919 | $ 124,487 | $ 116,562
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ |  |  |  |  | $ 172,887 |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  | 15,444 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares) |  |  |  |  | 0 | 0 | 538
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 22.24
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  | 273 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Granted in Period, Fair Value | $ |  |  |  |  | $ 90,193 | $ 134,232 | $ 176,475
The 2014 Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  | 75,000 |  |  |
Share Based Compensation Arrangement By Share Based Payment Awarded Term (Year) |  |  |  | 10 years |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 18 Key Persons [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 15,681 | 12,534 |  |  | 15,681 | 12,534
Number of Key People Issued Awards |  | 18 | 18 |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | The 18 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 18 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) | 8,713 | 9,021 | 7,213 |  |  |  |
The 2014 Plan [Member] | Restricted Stock [Member] | Officers and Directors [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] | Eurobulk Employees [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 6,731 | 6,660 | 5,321 |  |  |  |
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 |  |  |  | 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% |  |  |  |  |  |

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