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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating activities:    
Net income $ 650,000 $ 542,000
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 1,677,000 1,622,000
Deferred income tax 118,000 174,000
Stock-based compensation expense 55,000 50,000
Net accrued interest on lease financing 0 (27,000)
Changes in operating assets and liabilities:    
Receivables (575,000) (755,000)
Prepaid expenses and other assets 143,000 (60,000)
Customer deposits/deferred revenue (40,000) (31,000)
Accounts payable and accrued liabilities 589,000 134,000
Net cash from operating activities 2,617,000 1,649,000
Investing activities:    
Payment for purchase of property and equipment (497,000) (114,000)
Net cash (used in) investing activities (497,000) (114,000)
Financing activities:    
Principal payments on long-term debt (484,000) (495,000)
Principal payments on capital leases (1,037,000) (1,517,000)
Distributions to non-controlling interests 0 (106,000)
Proceeds from warrants and options exercised 0 115,000
Net cash (used in) financing activities (1,521,000) (2,003,000)
Net change in cash, cash equivalents, and restricted cash 599,000 (468,000)
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 3,101,000 2,653,000
Supplemental cash flow disclosure:    
Cash paid during the period for: Interest 453,000 491,000
Cash paid during the period for: Income taxes paid 12,000 22,000
Schedule of non-cash investing and financing activities    
Acquisition of equipment with long-term debt financing $ 0 $ 992,000