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Note 18 - Commitments and Contingencies (Details Textual) - USD ($) | Dec. 31, 2016 | Aug. 20, 2015
--- | --- | ---
Bank Guarantee to Secure Release of Vessel |  | $ 9,837,000
Contract Receivable, Due in Next Twelve Months | $ 94,963,675 |
Contract Receivable, Due in Year Two | 28,963,072 |
Contract Receivable, Due in Year Three | 21,150,188 |
Contract Receivable, Due in Year Four | 17,263,562 |
Contract Receivable, Due in Year Five | 10,760,745 |
Emihar Petroleum Inc [Member] |  |
Contract Receivable, Due in Year Two | $ 2,023,500 |

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- Definition The amount of guarantee made by a bank, lodged to the court, to secure the release of an arrested vessel. + References No definition available. + Details
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- Definition Amount billed to customers under long-term contracts or programs to be collected in the fifth fiscal year following the latest fiscal year. Excludes amounts due that have been withheld because of retainage provisions in a contract. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 310 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68065756&loc=d3e49354-109356 + Details
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