CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net income	$ 986,000	$ 685,000
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	3,364,000	3,234,000
Loss (gain) on sale of assets	6,000	(1,000)
Loss on early extinguishment of debt	0	108,000
Deferred income tax	366,000	176,000
Stock-based compensation expense	100,000	119,000
Net accrued interest on lease financing	(53,000)	0
Other non-cash items	0	4,000
Changes in operating assets and liabilities:
Receivables	(723,000)	(767,000)
Prepaid expenses and other assets	15,000	(262,000)
Customer deposits/deferred revenue	(57,000)	(108,000)
Accounts payable and accrued liabilities	34,000	213,000
Net cash from operating activities	4,038,000	3,401,000
Investing activities:
Payment for purchase of property and equipment	(1,469,000)	(575,000)
Proceeds from sale of equipment	150,000	0
Net cash (used in) investing activities	(1,319,000)	(575,000)
Financing activities:
Principal payments on long-term debt	(1,163,000)	(2,059,000)
Principal payments on capital leases	(2,642,000)	(2,055,000)
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	(291,000)	(301,000)
Proceeds from warrants and options exercised	115,000	1,137,000
Net cash (used in) financing activities	(2,989,000)	(3,271,000)
Net change in cash and cash equivalents	(270,000)	(445,000)
Cash and cash equivalents at beginning of period	2,871,000	2,209,000
Cash and cash equivalents at end of period	2,601,000	1,764,000
Supplemental cash flow disclosure:
Interest	978,000	1,066,000
Income taxes paid	30,000	97,000
Schedule of non-cash investing and financing activities
Acquisition of equipment with capital lease financing	$ 0	$ 7,401,000