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Note 8 - Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Interest on long-term debt	$ 2,839,121	$ 2,660,766
Administrative expenses	204,472	206,840
Other operating costs	563,333
Vessel operating and voyage expenses	2,273,553	2,431,873
Total	$ 5,880,479	$ 5,299,479

X

- Definition

Amount of expenses incurred but not yet paid classified administrative, due within one year or the normal operating cycle, if longer.

+ References

No definition available.

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for vessel operating and voyage expenses.

+ References

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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-Name Accounting Standards Codification
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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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