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Note 19 - Commitments and Contingencies (Details Textual) - USD ($) | Dec. 31, 2017 | Aug. 20, 2015
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Bank Guarantee to Secure Release of Vessel |  | $ 9,837,000
Contract Receivable, Due in Next Twelve Months | $ 90,394,968 |
Contract Receivable, Due in Year Two | 35,806,235 |
Contract Receivable, Due in Year Three | 21,966,407 |
Contract Receivable, Due in Year Four | 10,970,170 |
Contract Receivable, Due in Year Five | $ 3,519,740 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount billed to customers under long-term contracts or programs to be collected in the second 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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount billed to customers under long-term contracts or programs to be collected in the next 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 No definition available. + Details
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- Definition Amount billed to customers under long-term contracts or programs to be collected in the fourth 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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount billed to customers under long-term contracts or programs to be collected in the third 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://fasb.org/us-gaap/role/ref/legacyRef -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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