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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]    
Revenue $ 3,070,000 $ 3,424,000
Costs and expenses:    
Patient expenses 350,000 1,341,000
Selling, general and administrative 1,230,000 1,289,000
Loss on derecognition of gamma knife and related assets 0 663,000
Total 1,580,000 3,293,000
Operating income 1,490,000 131,000
Interest expense (91,000) (113,000)
Interest income 6,000 70,000
Interest income - sales-type sublease 132,000 42,000
Loss from investments in unconsolidated entities, net (1,386,000) (743,000)
Income (loss) before income taxes 151,000 (613,000)
Income tax (provision) benefit (9,000) 192,000
Net income (loss) $ 142,000 $ (421,000)
Basic and diluted net income (loss) per share (in dollars per share) $ 0.02 $ (0.05)
Weighted average common shares outstanding (in shares) 7,792,185 7,792,185