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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating activities:    
Net income $ 1,261,000 $ 1,317,000
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 5,050,000 4,929,000
Loss on sale or disposal of assets 15,000 0
Loss on early extinguishment of debt 0 108,000
Deferred income tax 500,000 378,000
Stock based compensation expense 158,000 161,000
Net accrued interest on lease financing (79,000) 0
Other non-cash items 0 4,000
Changes in operating assets and liabilities:    
Accounts receivable and other receivables (1,191,000) (1,281,000)
Prepaid expenses and other assets (944,000) (226,000)
Deferred revenue (84,000) (186,000)
Accounts payable and accrued liabilities 290,000 490,000
Net cash from operating activities 4,976,000 5,694,000
Investing activities:    
Payment for purchase of property and equipment (760,000) (1,050,000)
Proceeds from sale of equipment 150,000 0
Net cash (used in) investing activities (610,000) (1,050,000)
Financing activities:    
Principal payments on long-term debt (1,595,000) (2,383,000)
Principal payments on capital leases (3,823,000) (3,054,000)
Capital contributions from non-controlling interests 0 7,000
Distributions to non-controlling interests (519,000) (514,000)
Proceeds from warrants and options exercised 115,000 0
Reclassification of restricted cash (100,000) (200,000)
Proceeds from capital lease financing for reimbursement of payments for acquisition of equipment 0 1,137,000
Net cash (used in) financing activities (5,922,000) (5,007,000)
Net change in cash and cash equivalents (1,556,000) (363,000)
Cash and cash equivalents at beginning of period 2,871,000 2,209,000
Cash and cash equivalents at end of period 1,315,000 1,846,000
Supplemental cash flow disclosure:    
Cash paid during the period for: Interest 1,424,000 1,614,000
Cash paid during the period for: Income taxes paid 104,000 219,000
Schedule of non-cash investing and financing activities    
Acquisition of equipment with capital lease financing 2,153,000 8,332,000
Acquisition of equipment with long-term debt financing $ 992,000 $ 0