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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating activities:      
Net income $ 10,379 $ 4,990 $ 7,556
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion and amortization of asset retirement obligation 6,481 5,318 3,642
(Gain) loss on disposal of assets (59) 54 57
Loss on derivatives 5 455  
Loss on extinguishment of debt 1,051   1,230
Revenue reserve   (92)  
Amortization of deferred financing cost 159 251 86
Accretion of debt discount 263 519 183
Deferred income taxes 539 3,700 8,378
Stock-based compensation, net 1,426 792 418
Non-cash interest expense on revolving credit facility   706 1,852
Non-cash interest expense on Series A preferred stock 5,565 5,078 5,601
Changes in assets and liabilities:      
Accounts Receivables (3,319) 2,629 (4,367)
Unbilled Receivables 3,617    
Inventories (1,357) (2,462) 316
Prepaid expenses and other assets 133 2,423 (3,492)
Deferred revenue (5,518) 7,133 (183)
Accounts payable 761 (137) 759
Accrued and other expenses (481) (654) 272
Income taxes payable 7,058   (171)
Net cash provided by operating activities 26,703 30,703 22,137
Investing activities:      
Purchases of property, plant and equipment (2,519) (29,375) (30,888)
Proceeds from disposal of assets 49    
Net cash used in investing activities (2,470) (29,375) (30,888)
Financing activities:      
Repayment of line of credit     (9,230)
Repayments of notes payable (1,368) (456) (139)
Payments under equipment financing obligations (409) (390) (231)
Payment of deferred financing and amendment costs (1,178) (415) (659)
Proceeds from revolving credit facility 1,100 12,800 61,199
Repayment of revolving credit facility (65,316) (9,647) (3,500)
Proceeds from equity issuance 138,371    
Payment of equity transaction costs (11,047)    
Repayment of Series A preferred stock (40,328)   (39,999)
Cash dividend on Series A preferred stock (4) (5) (5)
Purchase of treasury stock (416) (121) (2)
Net cash provided by financing activities 19,405 1,766 7,434
Net increase (decrease) in cash and restricted cash 43,638 3,094 (1,317)
Cash and restricted cash at beginning of year 3,896 802 2,119
Cash and restricted cash at end of year 47,534 3,896 802
Supplemental disclosure of cash flow information      
Cash paid for interest 3,369 2,270 2,782
Cash paid for taxes 933 (1,093) 3,542
Non-cash investing and financing activities:      
Asset retirement obligation (188) (614) 1,544
Equipment purchased with debt   1,982 180
Equipment purchased under equipment financing obligations     2,217
Capitalized non-cash interest into property, plant and equipment 132 1,808 453
Debt issuance costs netted against proceeds     1,414
Capitalized expenditures in accounts payable and accrued expenses $ 48 $ 3,113 $ 4,386