CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 198,000	$ 80,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	235,000	238,000
(Income) loss from investment in unconsolidated entities, net	(155,000)	36,000
Accretion of asset retirement obligations	6,000	17,000
Change in guarantee liability	(2,000)	2,000
Deferred income taxes	118,000	48,000
Changes in:
Accounts receivable	(102,000)	(361,000)
Other current assets	16,000	22,000
Accounts payable and accrued expenses	32,000	18,000
Deferred revenue	258,000	159,000
Net cash provided by operating activities	604,000	259,000
Cash flows from investing activities:
Increase in due from related parties	(24,000)	(61,000)
Distributions from, investments in unconsolidated entities	124,000	0
Net cash provided by (used in) investing activities	100,000	(61,000)
Cash flows from financing activities:
Repayment of capital lease obligations	(292,000)	(147,000)
Net cash used in financing activities	(292,000)	(147,000)
Net change in cash and cash equivalents	412,000	51,000
Cash and cash equivalents - beginning of period	1,068,000	1,053,000
Cash and cash equivalents - end of period	1,480,000	1,104,000
Cash paid for:
Interest	41,000	54,000
Supplemental disclosure of noncash investing and financing activities:
Purchase of gamma knife and related leasehold improvements included in accounts payable	0	341,000
Increase in investment in unconsolidated entities through recording of guarantee liability	0	22,000
Increase in guarantee liability recorded	$ 0	$ 13,000