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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING ACTIVITIES      
Net income (loss) $ 2,940,000 $ 2,250,000 $ (576,000)
Adjustments to reconcile net income (loss) to net cash from operating activities:      
Depreciation and amortization 6,677,000 6,327,000 6,190,000
Loss on disposal of assets 15,000 0 0
Loss on early extinguishment of debt 0 108,000 0
Loss on write down investment in equity securities 579,000 0 2,140,000
Amortization of accrued interest on lease financing 80,000 0 0
Deferred income tax (benefit) expense (1,266,000) 772,000 298,000
Accrued interest on lease financing 33,000 414,000 0
Stock-based compensation expense 323,000 215,000 226,000
Other non-cash items 0 4,000 (31,000)
Changes in operating assets and liabilities:      
Receivables (860,000) (1,230,000) 178,000
Prepaid expenses and other assets (793,000) (283,000) (52,000)
Accounts payable, accrued liabilities and deferred revenue 125,000 (199,000) 175,000
Net cash from operating activities 7,853,000 8,378,000 8,548,000
INVESTING ACTIVITIES      
Payment for purchase of property and equipment (803,000) (1,042,000) (900,000)
Investment in equity securities 0 0 (10,000)
Proceeds from sale of equipment 150,000 0 0
Net cash (used in) investing activities (653,000) (1,042,000) (910,000)
FINANCING ACTIVITIES      
Principal payments on long-term debt (2,314,000) (2,968,000) (2,058,000)
Principal payments on capital leases (4,954,000) (4,171,000) (4,026,000)
Proceeds from certificate of deposit 0 0 9,000,000
Payments on line of credit 0 0 (8,780,000)
Capital contributions from non-controlling interests 0 7,000 46,000
Distributions to non-controlling interests (666,000) (699,000) (670,000)
Proceeds from warrants and options exercised 115,000 220,000 0
Proceeds from capital lease financing for reimbursement of payments for acquisition of equipment 0 1,137,000 0
Reclassification of restricted cash (100,000) (200,000) 0
Net cash (used in) financing activities (7,919,000) (6,674,000) (6,488,000)
Net change in cash and cash equivalents (719,000) 662,000 1,150,000
CASH AND CASH EQUIVALENTS, beginning of year 2,871,000 2,209,000 1,059,000
CASH AND CASH EQUIVALENTS, end of year 2,152,000 2,871,000 2,209,000
SUPPLEMENTAL CASH FLOW DISCLOSURE      
Cash paid for interest 1,712,000 2,150,000 1,670,000
Cash paid for income taxes 126,000 266,000 25,000
SCHEDULE OF NONCASH INVESTING AND FINANCING ACTIVITIES      
Acquisition of equipment with capital lease financing 2,153,000 8,878,000 1,343,000
Acquisition of equipment with long-term debt financing $ 992,000 $ 570,000 $ 1,016,000