Quarterly report pursuant to Section 13 or 15(d)

Debt (Narrative) (Details)

v3.7.0.1
Debt (Narrative) (Details)
$ in Thousands
6 Months Ended 30 Months Ended
Mar. 14, 2017
USD ($)
Jun. 30, 2017
USD ($)
item
Jun. 30, 2019
Jun. 29, 2016
USD ($)
Jun. 28, 2016
USD ($)
Debt Instrument [Line Items]          
Credit facility borrowing base         $ 20,000
Debt service coverage ratio minimum at each quarter   1.2      
Loans payable, net of issuance costs   $ 13,000      
Term loan fair value   $ 13,100      
Commitment fee percentage   2.30%      
Maximum [Member] | Scenario, Forecast [Member]          
Debt Instrument [Line Items]          
Ratio of net debt to EBITDAX     3.0    
Senior Tranche [Member]          
Debt Instrument [Line Items]          
Debt instrument, commitment fee   1.50%      
Line Of Credit Facility Maximum Borrowing Capacity         $ 50,000
Subordinated Tranche [Member]          
Debt Instrument [Line Items]          
Debt instrument, commitment fee         2.30%
Line Of Credit Facility Maximum Borrowing Capacity         $ 15,000
Additional Term Loan [Member]          
Debt Instrument [Line Items]          
Debt instrument, additional borrowing available       $ 5,000  
Borrowings $ 4,200        
Number of quarterly principal installments | item   5      
Commitment fees, amount $ 0        
Term Loan [Member]          
Debt Instrument [Line Items]          
Debt instrument maximum borrowing capacity       $ 15,000  
Debt instrument interest rate spread   5.75%      
Loans Payable   $ 13,300