Gamma Knife at NYU Medical Center (Details) - NYU [Member] - USD ($)		3 Months Ended
Oct. 31, 2012	Mar. 31, 2021
Gamma Knives at NYU Medical Center [Abstract]
Gain on termination of contract		$ 100,000
Minimum [Member]
Gamma Knives at NYU Medical Center [Abstract]
Cash reserves		$ 2,000,000
Perfexion Gamma Knife [Member]
Gamma Knives at NYU Medical Center [Abstract]
Terms of agreement with NYU		12 years
Removal cost	$ 525,000
Insurance coverage	$ 930,000

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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Cash outflow related to disposal costs of plants, whether by demolishing, dismantling, abandoning, sale, and so forth during the period.

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Period of agreement with NYU to operate a gamma knife at their facility.

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