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Note 6 - Long-term Debt (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Feb. 08, 2016
Nov. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Mar. 04, 2016
Feb. 25, 2016
Oct. 31, 2015
Senior Secured Debt [Member] | Subsequent Event [Member]              
Debt Instrument, Fee Amount           $ 2,250  
Repayments of Senior Debt $ 10,500            
Percentage of Future Quarterly Interest Payments 50.00%            
Debt Instrument, Interest Rate, Stated Percentage         8.00%    
Senior Secured Debt [Member]              
Debt Instrument, Fee Amount   $ 2,250          
Convertible Note Instrument, Due March 5, 2020 [Member]              
Debt Instrument, Interest Rate, Stated Percentage     7.00% 7.00%      
Deferred Finance Costs, Net   $ 400          
Subsequent Event [Member] | Fenner Valley Farms LLC [Member]              
Proceeds from Leases Held-for-investment $ 12,000            
Percentage of Future Quarterly Interest Payments     50.00%        
Percentage of Convertible Note Holders to Exchange Outstanding Convertible Notes   94.00%          
Debt Instrument, Convertible, Conversion Price   $ 8.05         $ 6.75
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature   $ 5,200 $ 5,139        
Stock Issued During Period, Value, Conversion of Convertible Securities     $ 1,006 $ 311      
Stock Issued During Period, Shares, Conversion of Convertible Securities     126,633