CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 139,000	$ 379,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	570,000	568,000
Loss (income) from investment in unconsolidated entities	190,000	(241,000)
Distributed earnings from unconsolidated entities	0	315,000
Accretion of asset retirement obligations	13,000	13,000
Accrued interest from short term loan receivable	(4,000)	0
Deferred income taxes	(390,000)	(175,000)
Changes in:
Accounts receivable	243,000	654,000
Other current assets	(120,000)	(25,000)
Accounts payable and accrued expenses	(139,000)	64,000
Deferred revenue	497,000	325,000
Income taxes payable	325,000	413,000
Net cash provided by operating activities	1,324,000	2,290,000
Cash flows from investing activities:
Repayment of amounts advanced to unconsolidated entities	0	28,000
Capital contributions to unconsolidated entities	0	(10,000)
Advances to unconsolidated entities	(1,019,000)	(42,000)
Advances made under short term loans	(257,000)	0
Purchase of gamma knife equipment	0	(28,000)
Increase in due from related parties	0	(21,000)
Net cash used in investing activities	(1,276,000)	(73,000)
Cash flows from financing activities:
Repayment of capital lease obligations	(453,000)	(505,000)
Net cash used in financing activities	(453,000)	(505,000)
Net change in cash and cash equivalents	(405,000)	1,712,000
Cash and cash equivalents - beginning of year	2,684,000	1,962,000
Cash and cash equivalents - end of year	2,279,000	3,674,000
Cash paid for:
Interest	60,000	77,000
Income Taxes	244,000	0
Supplemental disclosure of of noncash investing and financing activities:
Purchase of gamma knife equipment included in accounts payable	$ 0	$ 39,000