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Note 8 - Other Accrued Liabilities
12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
Note
8.
  Other Accrued Liabilities
 
Other accrued liabilities consist of:
 
 
 
December 31, 2016
 
 
December 31, 2015
 
Vessel and voyage expenses
  $
6,986,486
    $
8,901,904
 
General and administrative expenses
   
3,446,113
     
1,347,951
 
Other expenses
   
1,112,848
     
577,220
 
Balance
  $
11,545,447
    $
10,827,075