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Note 10 - Long-term Debt (Detail) (USD $) | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 2 Months Ended | 0 Months Ended | 1 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 16 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 06, 2012 | Jun. 21, 2012 | Jan. 12, 2012 | Sep. 23, 2011 | Apr. 20, 2011 | Mar. 01, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Amount After Waiver [Member] | Dec. 31, 2012 Minimum [Member] Term Loan [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Maximum [Member] Term Loan [Member] | Dec. 31, 2012 Maximum [Member] | Sep. 06, 2012 Not To Exceed [Member] | Dec. 31, 2012 Not To Exceed [Member] | Sep. 06, 2012 Lesser of [Member] DVB Bank [Member] Condition Met At Delivery [Member] | Sep. 06, 2012 Lesser of [Member] DVB Bank [Member] Condition Not Being Met [Member] | Feb. 29, 2012 BNP Paribas [Member] | May 10, 2012 Emporiki Bank [Member] | May 19, 2011 Term Loan - Supplemental Agreement [Member] | Dec. 31, 2013 Term Loan - Supplemental Agreement [Member] | Dec. 31, 2012 Term Loan - Supplemental Agreement [Member] | Jun. 30, 2013 Term Loan - Supplemental Agreement [Member] | Mar. 31, 2012 Term Loan - Supplemental Agreement [Member] | Aug. 31, 2012 Term Loan - Supplemental Agreement [Member] | Apr. 08, 2011 Term Loan - Supplemental Agreement [Member]
Debt Instrument, Increase, Additional Borrowings |  | $ 21,500,000 | $ 21,750,000 | $ 16,500,000 | $ 16,400,000 | $ 16,500,000 | $ 43,250,000 |  |  |  |  |  |  |  |  |  | $ 67,200,000 | $ 62,500,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  | 0.70% |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  | 1.90%
Value to Loan Ratio |  |  |  |  |  |  | 125.00% |  |  | 110.00% | 110.00% |  | 130.00% |  |  |  |  |  |  |  |  | 125.00% | 125.00% | 110.00% | 110.00% |  |
Repayments of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 791,823 | 12,826,919 | 1,500,000 |  |  |  |  |  |
Balloon Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,375,000
Required Loan Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 625,000 |
Percentage of Total Debt To Total Maket Value Adjusted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |
EBITDA to Interest Expense |  |  |  |  |  |  | 2.5:1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Required Ownership Percentage |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Dividends Paid To Free Cash Flow |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  |  |  | 2.39% | 2.23% | 2.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense, Debt |  |  |  |  |  |  | 9,035,248 | 7,864,282 | 7,418,572 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Costs Capitalized |  |  |  |  |  |  | 281,484 | 557,565 | 556,314 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  |  |  |  |  |  | 26,875,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Collateral for Borrowed Securities |  |  |  |  |  |  | $ 3,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Fair Market Value of Vessel Subject to the Minimum Employment Condition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70.00% | 65.00% |  |  |  |  |  |  |  |  |
Percentage of Fair Market Value of Vessel Subject to the Minimum Employment Condition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70.00% | 65.00% |  |  |  |  |  |  |  |  |
Debt Instrument Number of Quarterly Installments | 28 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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