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Long-Term Debt (Narrative) (Details) - USD ($)
Jan. 13, 2017
Jun. 27, 2016
Dec. 31, 2018
Mar. 31, 2017
Caterpillar Equipment Facility and Capital Lease        
Debt Instrument [Line Items]        
Interest rate   5.70%    
Periodic installments amount   $ 29,570    
Secured Debt | Note Payable - GF Comstock 2 LP        
Debt Instrument [Line Items]        
Interest rate 11.00%      
Principal amount $ 10,723,000      
Percentage of equity interest in subsidiaries 100.00%      
Debt discounts $ 568,000      
Debt issuance costs 528,000      
Early repayment, make whole payment $ 688,000      
Remaining balance of make whole obligation     $ 508,599  
Initial periodic payment period 2 years      
Line of Credit        
Debt Instrument [Line Items]        
Maximum borrowing capacity     10,000,000.0  
Amount outstanding under agreement     0  
Available borrowing capacity     $ 9,500,000  
Line of Credit | Loan Commitment Agreement Due 2021        
Debt Instrument [Line Items]        
Interest rate       11.00%
Maximum borrowing capacity       $ 10,000,000