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Note 2 - Corporate Reorganization (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 15, 2019
USD ($)
Aug. 02, 2016
USD ($)
shares
Mar. 30, 2016
USD ($)
$ / item
shares
Feb. 09, 2016
USD ($)
Oct. 02, 2015
Oct. 09, 2014
Mar. 31, 2016
USD ($)
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
USD ($)
Charters Agreement Term     1 year 180 days   7 years 1 year 180 days          
First Lien Facility [Member] | First Lien Lenders [Member]                      
Long-term Debt     $ 201,468,750                
Amount Undrawn Prior to Refinancing     10,000,000                
Payments of Debt Issuance Costs     600,000               $ 5,651,000
Debt Instrument, Covenant, Minimum Liquidity, Minimum Threshold     $ 8,140,000                
Debt Instrument, Covenant, Minimum Liquidity, Minimum Threshold Per Vessel | $ / item     185,000                
Repayments of Long-term Debt     $ 11,718,750                
First Lien Facility [Member] | First Lien Lenders [Member] | Scenario, Forecast [Member]                      
Debt Instrument, Covenant Percentage of Aggregate Principal, Minimum Threshold               100.00% 120.00% 110.00%  
Debt Instrument, Periodic Payment $ 3,786,346                    
First Lien Facility [Member] | First Lien Lenders [Member] | Through December 31, 2018 [Member]                      
Debt Instrument, Covenant, Periodic Payment Amount, Percentage of Excess Cash Flow from Preceding Period     75.00%                
Debt Instrument, Maximum Annual Periodic Payment     $ 15,625,000                
First Lien Facility [Member] | First Lien Lenders [Member] | After December 31, 2018 [Member]                      
Debt Instrument, Periodic Payment     3,906,250                
First Lien Facility [Member] | First Lien Lenders [Member] | Revolving Credit Facility [Member]                      
Line of Credit Facility, Maximum Borrowing Capacity     50,000,000                
Line of Credit Facility, Remaining Borrowing Capacity                     $ 25,000,000
Repayments of Lines of Credit     30,158,500                
Forbearance Agreement [Member]                      
Repayments of Lines of Credit       $ 3,906,250     $ 3,906,250        
Second Lien Facility [Member] | Second Lien Lenders [Member]                      
Long-term Debt     60,000,000                
Debt Instrument, Covenant, Minimum Liquidity, Minimum Threshold     $ 6,512,000                
Debt Instrument, Covenant, Minimum Liquidity, Minimum Threshold Per Vessel | $ / item     148,000                
Debt Instrument, Issuance of Stock to Lenders Pro Rata Based on Participation | shares     16,889,828                
Debt Instrument, Issuance of Stock to Lenders Pro Rata Based on Participation, Percentage of Outstanding Stock     90.00%                
Debt Instrument, Issuance of Stock to Lenders Based on Participation | shares     371,276                
Debt Instrument, Issuance of Stock to Lenders Based on Participation, Percent of Previous Outstanding Common Stock     19.40%                
Debt Instrument Issuance of Stock to Lenders Pro Rata Based on Participation, Additional | shares   16,420,098                  
Debt Instrument, Unamortized Discount   $ 17,800,000                  
Second Lien Facility [Member] | Second Lien Lenders [Member] | Chairman and Chief Financial Officer [Member]                      
Debt Instrument, Issuance of Stock to Lenders Pro Rata Based on Participation | shares   98,454                  
Second Lien Facility [Member] | Second Lien Lenders [Member] | London Interbank Offered Rate (LIBOR) [Member]                      
Debt Instrument, Basis Spread on Variable Rate     14.00%                
Debt Instrument, Reference Rate Floor     1.00%                
Second Lien Facility [Member] | Second Lien Lenders [Member] | Base Rate [Member]                      
Debt Instrument, Basis Spread on Variable Rate     13.00%                
Second Lien Facility [Member] | Second Lien Lenders [Member] | Scenario, Forecast [Member]                      
Debt Instrument, Covenant Percentage of Aggregate Principal, Minimum Threshold               100.00% 120.00% 110.00%