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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities:    
Net income $ 1,151,000 $ 986,000
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 3,364,000 3,364,000
Loss on sale of assets 0 6,000
Deferred income tax 229,000 366,000
Stock-based compensation expense 112,000 100,000
Net accrued interest on lease financing 7,000 (53,000)
Changes in operating assets and liabilities:    
Receivables 77,000 (723,000)
Prepaid expenses and other assets 481,000 15,000
Customer deposits/deferred revenue (58,000) (57,000)
Accounts payable and accrued liabilities 191,000 34,000
Net cash from operating activities 5,554,000 4,038,000
Investing activities:    
Payment for purchase of property and equipment (792,000) (477,000)
Proceeds from sale of equipment 0 150,000
Net cash (used in) investing activities (792,000) (327,000)
Financing activities:    
Principal payments on long-term debt (1,278,000) (1,163,000)
Principal payments on capital leases (2,066,000) (2,642,000)
Distributions to non-controlling interests (77,000) (291,000)
Proceeds from warrants and options exercised 0 115,000
Net cash (used in) financing activities (3,421,000) (3,981,000)
Net change in cash, cash equivalents, and restricted cash 1,341,000 (270,000)
Cash, cash equivalents, and restricted cash at beginning of period 2,502,000 3,121,000
Cash, cash equivalents, and restricted cash at end of period 3,843,000 2,851,000
Supplemental cash flow disclosure:    
Cash paid during the period for: Interest 884,000 978,000
Cash paid during the period for: Income taxes paid 88,000 30,000
Schedule of non-cash investing and financing activities    
Acquisition of equipment with capital lease financing 1,679,000 0
Acquisition of equipment with long-term debt financing $ 0 $ 992,000