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Note 7 - Debt (Details Textual)
$ / shares in Units, $ in Thousands
6 Months Ended
May 17, 2017
May 16, 2017
Apr. 21, 2017
Feb. 24, 2017
USD ($)
Feb. 21, 2017
$ / shares
Feb. 20, 2017
Feb. 17, 2017
USD ($)
shares
Aug. 05, 2016
USD ($)
Jul. 20, 2016
USD ($)
May 13, 2016
USD ($)
May 11, 2016
USD ($)
Jan. 15, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jul. 13, 2015
USD ($)
Jun. 30, 2017
USD ($)
shares
Jun. 26, 2017
USD ($)
May 15, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 24, 2015
USD ($)
Stock Issued During Period, Value, New Issues                             $ 28,623        
Short-term Debt                             3,776      
Xanthe Holdings Limited [Member] | Series C Convertible Preferred Stock Accounted for as Debt [Member]                                      
Amortization of Debt Discount (Premium)                             2,907        
Debt Issuance Costs, Net                             92        
Debt Instrument, Unamortized Discount             $ 7,500               4,593        
Short-term Debt                             4,685        
Xanthe Holdings Limited [Member] | Series C Convertible Preferred Stock [Member]                                      
Stock Issued During Period, Shares, New Issues | shares             7,500                        
Stock Issued During Period, Value, New Issues             $ 7,500                        
Notes [Member]                                      
Short-term Debt                             $ 3,776 $ 3,776      
Notes [Member] | Unsecured Debt [Member]                                      
Debt Instrument, Interest Rate, Stated Percentage                             6.00%        
Notes [Member] | Xanthe Holdings Limited [Member]                                      
Short-term Debt                                 $ 776    
ABN Bank [Member]                                      
Debt Instrument, Default Clause, Minimum Retainable Common Shares Outstanding Percentage     30.00%                                
Debt Instrument, Default Clause Minimum Voting Rights Interest, Percentage     50.00%                                
Long-term Line of Credit                             $ 56,700        
ABN Bank [Member] | MT Eco Fleet [Member]                                      
Proceeds from Lines of Credit                         $ 1,200 $ 21,000          
ABN Bank [Member] | M/T Eco Revolution [Member]                                      
Proceeds from Lines of Credit                       $ 22,200              
ABN Bank [Member] | M/T Nord Valiant [Member]                                      
Proceeds from Lines of Credit               $ 20,000                      
ABN Bank [Member] | M/T Eco Fleet and Hull No S419 [Member] | London Interbank Offered Rate (LIBOR) [Member]                                      
Debt Instrument, Basis Spread on Variable Rate                             3.90%        
Debt Instrument, LIBOR Rate                             1.30%        
ABN Bank [Member] | M/T Eco Fleet and Hull No S419 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Tranche C [Member]                                      
Debt Instrument, Basis Spread on Variable Rate                             3.75%        
Norddeutsche Landesbank Girozentrale Bank [Member]                                      
Debt Instrument, Default Clause, Minimum Retainable Common Shares Outstanding Percentage 10.00% 20.00%                                  
Long-term Line of Credit                             $ 21,139        
Norddeutsche Landesbank Girozentrale Bank [Member] | M/T Stenaweco Excellence [Member]                                      
Proceeds from Lines of Credit                   $ 23,185 $ 23,185                
Norddeutsche Landesbank Girozentrale Bank [Member] | M/T Stenaweco Excellence [Member] | London Interbank Offered Rate (LIBOR) [Member]                                      
Debt Instrument, Basis Spread on Variable Rate                             3.43%        
Debt Instrument, LIBOR Rate                             1.30%        
Alpha Bank of Greece [Member] | M/T Stenaweco Elegance [Member]                                      
Debt Instrument, Basis Spread on Variable Rate                             3.50%        
Debt Instrument, LIBOR Rate                             1.30%        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid                 $ 12,500                    
Proceeds from Lines of Credit       $ 23,350         $ 23,350                    
Debt Instrument, Net Asset Cover Ratio                 125.00%                    
Long-term Line of Credit                             $ 22,950        
Alpha Bank of Greece [Member] | M/T Stenaweco Elegance [Member] | First 12 Consecutive Quarterly Installments [Member]                                      
Number of Consecutive Quarterly Installments                 12                    
Line of Credit Facility, Periodic Payment                 $ 400                    
Alpha Bank of Greece [Member] | M/T Stenaweco Elegance [Member] | Final 20 Consecutive Quarterly Installments [Member]                                      
Number of Consecutive Quarterly Installments                 20                    
Line of Credit Facility, Periodic Payment                 $ 303                    
Family Trading [Member] | Immediate Family Member of Management or Principal Owner [Member] | Revolving Credit Facility [Member]                                      
Debt Instrument, Term         3 years                            
Line of Credit Facility, Commitment Fee Percentage         2.50% 5.00%                          
Maximum Mandatory Cash Prepayment, Amount                             3,500        
Debt Instrument, Convertible, Threshold Consecutive Trading Days         20                            
Debt Instrument, Convertible, Conversion Price | $ / shares         $ 0.60                            
Long-term Line of Credit                             2,958        
Debt Issuance Costs, Net                             511        
Line of Credit Facility, Commitment Fee Amount                             40        
Interest Expense, Related Party                             $ 23        
Debt Instrument, Convertible, Number of Equity Instruments                             5,034,161        
Stock Issued During Period, Shares, New Issues | shares                             2,590        
Debt Instrument, Interest Rate, Stated Percentage         10.00% 9.00%                          
Line of Credit Facility, Maximum Borrowing Capacity                                     $ 15,000
Accrued Liabilities                             $ 1,198        
Amortization of Debt Issuance Costs                             $ 842