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Note 9 - Long-Term Debt (Detail) (USD $) | 0 Months Ended | 12 Months Ended |  | 0 Months Ended |  | 1 Months Ended |  | 0 Months Ended |  | 0 Months Ended | 6 Months Ended |  | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended |  |  | 0 Months Ended | 1 Months Ended | 0 Months Ended |  | 0 Months Ended |  | 1 Months Ended | 12 Months Ended |
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Nov. 05, 2010 | Jun. 11, 2007 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Sep. 04, 2006 | Nov. 15, 2006 Preceeding 4 Payments (Member) Xingang Shipping Ltd [Member] | Jun. 11, 2007 Extended (Member) | Jun. 11, 2007 Extension (Member) | Jun. 11, 2007 Margin (Member) Manolis Shipping Ltd [Member] | May 26, 2005 Ninos and Kuo Hsiung [Member] Below [Member] Allendale Investments SA and Alterwall Business Inc. [Member] | May 26, 2005 Ninos and Kuo Hsiung [Member] Above [Member] Allendale Investments SA and Alterwall Business Inc. [Member] | May 26, 2005 Ninos and Kuo Hsiung [Member] Allendale Investments SA and Alterwall Business Inc. [Member] | Sep. 04, 2006 First Two Installments [Member] Prospero Maritime Inc. [Member] | Sep. 04, 2006 Second Installment [Member] Prospero Maritime Inc. [Member] | Sep. 04, 2006 Eleven Installments [Member] Prospero Maritime Inc. [Member] | Sep. 04, 2006 Minimum [Member] Prospero Maritime Inc. [Member] | Jun. 11, 2007 Minimum [Member] Manolis Shipping Ltd [Member] | Jun. 11, 2007 Maximum [Member] Manolis Shipping Ltd [Member] | Dec. 31, 2006 Xenia International Corp. [Member] | Jun. 30, 2006 Xenia International Corp. [Member] | Sep. 04, 2006 Prospero Maritime Inc. [Member] | Nov. 15, 2006 Xingang Shipping Ltd [Member] Four Installments [Member] | Nov. 15, 2006 Xingang Shipping Ltd [Member] Sixteen Installments [Member] | Dec. 31, 2013 Xingang Shipping Ltd [Member] Eight Installments [Member] | Nov. 15, 2006 Xingang Shipping Ltd [Member] | Dec. 31, 2013 Xingang Shipping Ltd [Member] | Jun. 11, 2007 Manolis Shipping Ltd [Member] | Feb. 28, 2008 Trust Navigation Corp [Member] First Due [Member] | Feb. 28, 2008 Trust Navigation Corp [Member] Next Four Installments [Member] | Nov. 30, 2010 Trust Navigation Corp [Member] Second Fourth Installment [Member] | Nov. 30, 2010 Trust Navigation Corp [Member] Final Installment [Member] | Nov. 30, 2010 Trust Navigation Corp [Member] Refinanced Balloon Payment [Member] | Nov. 30, 2010 Trust Navigation Corp [Member] | Aug. 31, 2010 Trust Navigation Corp [Member] | Feb. 28, 2008 Trust Navigation Corp [Member] | Oct. 29, 2010 Trust Navigation Corp [Member] | Oct. 31, 2007 Trust Navigation Corp [Member] | Jan. 19, 2009 SAF-Concord Shipping Ltd. [Member] | Apr. 30, 2009 Eleni Shipping Ltd. [Member] First Two Installments [Member] | Apr. 30, 2009 Eleni Shipping Ltd. [Member] Second Two Installments [Member] | Apr. 30, 2009 Eleni Shipping Ltd. [Member] Third Two Installments [Member] | Apr. 30, 2009 Eleni Shipping Ltd. [Member] Fourth Four Installments [Member] | Apr. 30, 2009 Eleni Shipping Ltd. [Member] Balloon Payment [Member] | Apr. 30, 2009 Eleni Shipping Ltd. [Member] | Dec. 15, 2009 Pantelis Shipping Corp. [Member] Four Installments [Member] | Dec. 15, 2009 Pantelis Shipping Corp. [Member] Twenty-Eight Installments [Member] | Dec. 15, 2009 Pantelis Shipping Corp. [Member] | Nov. 05, 2010 Aggeliki Shipping Ltd [Member] | Dec. 31, 2010 Noumea Shipping Ltd [Member] Tranche A [Member] | Nov. 05, 2010 Noumea Shipping Ltd [Member] Tranche A [Member] | Dec. 31, 2010 Noumea Shipping Ltd [Member] Tranche B [Member] | Nov. 05, 2010 Noumea Shipping Ltd [Member] Tranche B [Member] | Nov. 05, 2010 Noumea Shipping Ltd [Member] Tranche A and B [Member] | Dec. 28, 2010 Noumea Shipping Ltd [Member] | May 25, 2005 Allendale Investments SA and Alterwall Business Inc. [Member] | Dec. 31, 2010 Allendale Investments SA and Alterwall Business Inc. [Member] | Dec. 31, 2009 Allendale Investments SA and Alterwall Business Inc. [Member] | Dec. 31, 2008 Allendale Investments SA and Alterwall Business Inc. [Member] | Dec. 31, 2007 Allendale Investments SA and Alterwall Business Inc. [Member] | Dec. 31, 2006 Allendale Investments SA and Alterwall Business Inc. [Member] | May 26, 2005 Allendale Investments SA and Alterwall Business Inc. [Member]
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,500,000 |  |  |  | $ 20,000,000 |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  | $ 15,000,000 | $ 10,000,000 |  |  |  |  |  | $ 10,000,000 |  |  | $ 13,000,000 | $ 8,500,000 |  |  |  |  |  | $ 20,000,000 |  |  |  |  |  |  | $ 20,000,000
Line of Credit Facility Number of Quarterly Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24 |  |  |  |  |  |
Debt Instrument, Periodic Payment |  |  |  |  |  |  |  |  | 250,000 |  |  |  |  | 1,200,000 | 1,000,000 | 825,000 |  |  |  | 265,000 |  |  | 750,000 | 250,000 | 200,000 | 1,000,000 |  | 160,000 |  |  | 550,000 |  |  | 50,000 |  | 750,000 |  |  | 250,000 | 100,000 | 400,000 | 600,000 |  |  |  | 500,000 | 280,000 |  | 303,000 | 720,000 |  |  | 625,000 |  |  |  | 1,000,000 | 450,000 | 775,000 | 1,125,000 | 1,500,000 |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 0.95% |  |  |  | 5.00% |  |  | 1.375% |  |  |  | 0.90% |  |  | 0.95% |  |  |  |  |  | 0.935% | 5.30% | 0.80% |  |  |  |  |  | 0.90% |  |  | 3.75% |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |
Debt Instrument Percentage To Fair Market Value |  |  |  |  |  |  |  |  |  |  | 60.00% | 60.00% |  |  |  |  |  | 55.00% | 0.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Number of Quarterly Payments | 20 |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  | 23 |  |  |  |  |  | 8 |  |  | 1,850,000 | 4 |  |  |  | 10 | 4 | 4 |  |  |  |  |  |  |  |  |  | 4 | 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Balloon Payment |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  | 2,155,000 |  | 3,025,000 |  |  |  | 5,000,000 | 3,400,000 | 4,880,000 |  |  |  | 2,400,000 | 2,400,000 | 1,900,000 |  |  |  |  | 5,000,000 |  |  |  | 800,000 |  | 4,600,000 |  |  | 3,160,000 | 2,440,000 | 6,360,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Overall Liquidity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Number Of Semi-Annual Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 | 2 | 4 |  |  |  |  |  |  | 12 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Minimum Cash Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  | 300,000 |  | 300,000 |  |  |  |  |  | 300,000 |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Number of Consecutive Installments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Minimum Deposit Requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Number of Periodic Payments |  | thirty-two |  |  |  |  |  | eight |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | twenty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Margin Percentage Above LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.70% | 2.50% |  |  | 2.70% | 2.85% |  |  |  | 4.00% | 2.65% |  |  |  |  |  |  |  |
Repayments of Bank Debt |  |  | 13,332,000 | 13,472,000 | 11,630,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 | 5,000,000 |  |  |  |  |  |  |  |  |  |
Limited Dividends Percentage Loans to Profits |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 9,926,011 | 5,920,111 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense, Debt |  |  | $ 1,841,245 | $ 2,046,420 | $ 1,389,647 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Discussion of whether the debt instrument is secured or unsecured, and, if secured, a description of the collateral and guarantees required or provided. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 37, 38, 39 -IssueDate 2006-05-01 -Chapter 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The cash outflow to settle a bank borrowing during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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