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Note 11 - Long-term Debt (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2015 | Sep. 30, 2015 | Sep. 14, 2015 | Sep. 03, 2015 | Aug. 04, 2015 | Jul. 31, 2015 | Jul. 07, 2015 | Apr. 21, 2015 | Mar. 27, 2015 | Jan. 08, 2015 | Oct. 01, 2014 | Jun. 30, 2014 | Apr. 25, 2014 | Mar. 31, 2014 | Dec. 20, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jul. 04, 2014 | Apr. 16, 2014 | Apr. 14, 2014
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 155,100,000 |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,943,588 |  |  |  |  |
Term Loan Financial Covenants, Cash Requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,146,877 |  |  |  |  |
Percentage of Dividends Paid To Free Cash Flow |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.67% | 2.28% | 2.23% |  |  |
Interest Expense, Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,175,944 | $ 8,746,786 | $ 7,997,247 |  |  |
Interest Costs Capitalized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,822,443 | $ 2,113,297 | $ 819,296 |  |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,600,000 |  |  |  |  |
Quarterly Commitment Fee Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.80% |  |  |  |  |
July 4, 2014 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Payable to Bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,750,000 |  |
Second Facility Agreeement with Bank [Member] | LPG Vessels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,400,000
First Tranche [Member] | Term Loan Entered Into on December 20, 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  | $ 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Tranche [Member] | Term Loan with Bank, March 24, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,150,000 |  |  |  |  |  |  |
First Tranche [Member] | July 4, 2014 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  | $ 11,375,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Tranche [Member] | Term Loan 21 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  | $ 25,350,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Tranche [Member] | Term Loan 19 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | $ 22,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Second Tranche [Member] | Term Loan Entered Into on December 20, 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Second Tranche [Member] | Term Loan with Bank, March 24, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  | $ 17,150,000 |  |  |  |  |  |  |  |  |
Second Tranche [Member] | July 4, 2014 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  | $ 11,375,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third Tranche [Member] | Term Loan with Bank, March 24, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  | $ 15,925,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third Tranche [Member] | First Facility Agreement with a Bank [Member] | LPG Vessels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  | $ 15,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Two of Three Tranches [Member] | First Facility Agreement with a Bank [Member] | LPG Vessels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,250,000 |  |  |  |  |  |  |  |
Eco Invictus Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  | $ 13,000,000 |  |  |  |  |  |  |  |  |  |
Term Loan 17 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  | $ 20,925,000 |  |  |  |  |  | $ 20,925,000 |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,065,000 |  |  |  |  |
Term Loan 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  |  |  | $ 13,500,000 |  |  |  |  |  |  | $ 14,500,000 |  |  |  |  |
Lesser of [Member] | Condition Met At Delivery [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 67,200,000 |  |  |  |  |  |
Percentage of Fair Market Value of Vessel Subject to the Minimum Employment Condition |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70.00% |  |  |  |  |  |
Lesser of [Member] | Condition Not Being Met [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 62,400,000 |  |  |  |  |  |
Percentage of Fair Market Value of Vessel Subject to the Minimum Employment Condition |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |
Maximum [Member] | First Facility Agreement with a Bank [Member] | LPG Vessels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000,000 |
Maximum [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value to Loan Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.70% |  |  |  |  |
Minimum [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value to Loan Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125.00% |  |  |  |  |
Not To Exceed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Total Debt To Total Maket Value Adjusted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |
Numerator [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Long-term Debt (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBITDA to Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.5 |  |  |  |  |

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