Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Current taxes [Abstract]
Federal	$ 32,000	$ 55,000
State	137,000	9,000
Current taxes	169,000	64,000
Deferred taxes [Abstract]
Federal	(201,000)	(247,000)
State	(160,000)	86,000
Deferred taxes	(361,000)	(161,000)
Income tax (benefit) provision	(192,000)	(97,000)
Reconciliation of Tax Provision (Benefit) [Abstract]
Income tax at the federal statutory rate	(128,000)	149,000
State income tax, net of federal taxes	(55,000)	23,000
Permanent differences and other	(9,000)	26,000
Benefit of federal tax rate decrease	0	(295,000)
Income tax (benefit) provision	(192,000)	(97,000)
Deferred tax asset [Abstract]
Basis differences in unconsolidated entities, including advances and loans to those entitles	373,000	0
Excess of book depreciation over tax depreciation	0	40,000
Deferred tax assets, gross	373,000	40,000
Deferred tax liability [Abstract]
Basis differences in unconsolidated entities	0	(115,000)
Deferred gain on disposal of gamma knife	(577,000)	(524,000)
Excess of tax depreciation over book depreciation	(108,000)	0
Net effect of conversion from the accrual basis of accounting to the cash basis of accounting for tax purposes primarily related to accounts receivable, prepaid expense, deferred revenue, and accounts payable	(2,000)	(76,000)
Net deferred tax liability	$ (314,000)	$ (675,000)
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal corporate tax rate	21.00%	35.00%