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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
OPERATING ACTIVITIES      
Net income $ 1,630,000 $ 2,940,000 $ 2,250,000
Adjustments to reconcile net income to net cash from operating activities:      
Depreciation and amortization 6,818,000 6,677,000 6,327,000
Loss on disposal of assets 0 15,000 0
Loss on early extinguishment of debt 0 0 108,000
Loss on write down investment in equity securities 0 579,000 0
Amortization of accrued interest on lease financing 0 80,000 0
Deferred income tax expense (benefit) 48,000 (1,266,000) 772,000
Accrued interest on lease financing 39,000 33,000 414,000
Stock-based compensation expense 223,000 323,000 215,000
Other non-cash items 0 0 4,000
Changes in operating assets and liabilities:      
Receivables (420,000) (860,000) (1,230,000)
Prepaid expenses and other assets (231,000) (793,000) (283,000)
Accounts payable, accrued liabilities and deferred revenue 115,000 125,000 (199,000)
Net insurance proceeds receivable (160,000) 0 0
Net cash from operating activities 8,062,000 7,853,000 8,378,000
INVESTING ACTIVITIES      
Payment for purchase of property and equipment (1,577,000) (803,000) (1,042,000)
Proceeds from insurance 51,000 0 0
Proceeds from sale of equipment 0 150,000 0
Net cash (used in) investing activities (1,526,000) (653,000) (1,042,000)
FINANCING ACTIVITIES      
Principal payments on long-term debt (2,467,000) (2,314,000) (2,968,000)
Principal payments on capital leases (4,089,000) (4,954,000) (4,171,000)
Capital contributions from non-controlling interests 0 0 7,000
Distributions to non-controlling interests (690,000) (666,000) (699,000)
Proceeds from warrants and options exercised 0 115,000 220,000
Proceeds from capital lease financing for reimbursement of payments for acquisition of equipment 0 0 1,137,000
Net cash (used in) financing activities (7,246,000) (7,819,000) (6,474,000)
Net change in cash and cash equivalents (710,000) (619,000) 862,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of year 2,502,000 3,121,000 2,259,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of year 1,792,000 2,502,000 3,121,000
SUPPLEMENTAL CASH FLOW DISCLOSURE      
Cash paid for interest 1,727,000 1,712,000 2,150,000
Cash paid for income taxes 459,000 126,000 266,000
SCHEDULE OF NONCASH INVESTING AND FINANCING ACTIVITIES      
Acquisition of equipment with capital lease financing 1,679,000 2,153,000 8,878,000
Acquisition of equipment with long-term debt financing 1,853,000 992,000 570,000
Insurance proceeds receivable and due $ 977,000 $ 0 $ 0