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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
OPERATING ACTIVITIES    
Net income $ 542,000 $ 332,000
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 1,622,000 1,574,000
(Gain) on sale of assets 0 (1,000)
Loss on early extinguishment of debt 0 108,000
Deferred income tax 174,000 64,000
Stock-based compensation expense 50,000 59,000
Net accrued interest on lease financing (27,000) 0
Other non-cash items 0 4,000
Changes in operating assets and liabilities:    
Receivables (755,000) (500,000)
Prepaid expenses and other assets (60,000) 22,000
Customer deposits/deferred revenue (31,000) (78,000)
Accounts payable and accrued liabilities 134,000 136,000
Net cash from operating activities 1,649,000 1,720,000
Investing activities:    
Payment for purchase of property and equipment (1,106,000) (333,000)
Net cash used in investing activities (1,106,000) (333,000)
Financing activities:    
Principal payments on long-term debt (495,000) (1,439,000)
Principal payments on capital leases (1,517,000) (1,064,000)
Proceeds from long-term debt financing on property and equipment 992,000 0
Capital contributions from non-controlling interests 0 7,000
Distributions to non-controlling interests (106,000) (97,000)
Proceeds from warrants and options exercised 115,000 0
Proceeds from capital lease financing for reimbursement of payments for acquisition of equipment 0 1,137,000
Net cash used in financing activities (1,011,000) (1,456,000)
Net change in cash and cash equivalents (468,000) (69,000)
Cash and cash equivalents at beginning of period 2,871,000 2,209,000
Cash and cash equivalents at end of period 2,403,000 2,140,000
Supplemental cash flow disclosure:    
Interest 491,000 515,000
Income taxes 22,000 96,000
Schedule of non-cash investing and financing activities    
Acquisition of equipment with capital lease financing $ 0 $ 6,870,000