Organization and Business	12 Months Ended
Dec. 31, 2018
Organization and Business [Abstract]
Organization and Business	Note A – Organization and Business U.S. NeuroSurgical Holdings, Inc. owns and operates, through its wholly-owned subsidiaries, stereotactic radiosurgery centers, utilizing gamma knife technology, and holds other interests in radiological treatment facilities. As used herein, unless the context indicates otherwise, the term “Company”, “Registrant” and “Holdings” means U.S. NeuroSurgical Holdings, Inc. and its wholly-owned subsidiary, U.S. NeuroSurgical, Inc. (“USN”), and the wholly-owned subsidiaries of USN, U.S. NeuroSurgical Physics, Inc. and USN Corona, Inc. U.S. NeuroSurgical, Inc. a Delaware corporation, was organized in July 1993 for the purpose of owning and operating stereotactic radiosurgery centers, utilizing the gamma knife technology. USN holds an interest in one gamma knife center on the premises of New York University Medical Center (“NYU”) in New York, New York. Management continues to explore opportunities to organize and participate in additional gamma knife centers. USN’s business strategy is to provide a mechanism whereby hospitals, physicians, and patients can have access to gamma knife treatment capability, a high capital cost item. USN provides the gamma knife to medical facilities on a “cost per treatment” basis. USN holds an interest in the gamma knife unit and is reimbursed by the facility where it is housed, based on utilization. During the fourth quarter of 2007, USN formed a wholly-owned subsidiary, USN Corona, Inc. (“USNC”), to carry investments in Corona Gamma Knife, LLC and NeuroPartners, LLC. Those investments were formed to develop and manage a gamma knife center at San Antonio Regional Hospital in Upland, California. (See Note C[1]) During 2010, through the formation of a joint venture, in which it has a noncontrolling interest, the Company expanded its market strategy to include opportunities to develop cancer centers featuring radiation therapy. These centers utilize linear accelerators with IMRT (Intensity Modulated Radiation Therapy) and IGRT (Image Guided Radiation Therapy) capabilities. In 2010, the Company formed Florida Oncology Partners, LLC (“FOP”) in partnership with local physicians and other investors. USNC owns a 24% interest in the venture. FOP’s first center was located in Miami, Florida and opened in the second quarter of 2011. The Company entered into an arrangement to sell the center to 21^st Century Oncology in December 2015. The sale had not occurred as of December 31, 2018. (See Note C[2]) During 2011, the Company participated in the formation of Boca Oncology Partners RE, LLC (“BOPRE”), for the purpose of acquiring an interest in Boca West, IMP, LLC, (“Boca West, IMP”) which owns a medical office building. (See Note C[3]). In 2015, Medical Oncology Partners LLC (“MOP”), was formed in partnership with local physicians and other investors. MOP was established to acquire a 100% equity interest in United Oncology Medical Associates of Florida, LLC (“UOMA”). USNC was not a member of MOP at the time of its formation, as it was not able to participate in MOP’s formation due to the fact that USNC was not a physician. An application was filed for a waiver and on December 22, 2016, USNC was cleared to become a part owner of MOP. USNC currently owns 35.83% of MOP. (See Note C[4]) On September 3, 2015, pursuant to the Agreement and Plan of Reorganization (the “Merger Agreement”), dated as of September 3, 2015, by and among USN, Holdings and U.S. NeuroSurgical Merger Sub, Inc. (“Merger Sub”), the Company adopted a new holding company organizational structure whereby USN is now a wholly owned subsidiary of Holdings. This structure did not result in any changes to the assets or operations of the Company, but management believes that it will create a more flexible framework for possible future transactions and organizational and operational adjustments. The holding company organizational structure was effected by a merger (the “Merger”) conducted pursuant to Section 251(g) of the Delaware General Corporation Law (the “DGCL”), which provides for the formation of a holding company structure without a vote of the stockholders of the constituent corporations. Because the holding company organizational structure occurred at the parent company level, the remainder of the Company’s subsidiaries, operations and customers were not affected by this transaction. In order to effect the Merger, USN formed Holdings as its wholly owned subsidiary and Holdings formed Merger Sub as its wholly owned subsidiary. Under the terms of the Merger Agreement, Merger Sub merged with and into USN, with USN surviving the merger and becoming a direct, wholly owned subsidiary of Holdings. Immediately prior to the Merger, Holdings had no assets, liabilities or operations. Pursuant to the Merger Agreement, all of the outstanding capital stock of USN was converted, on a share for share basis, into capital stock of Holdings. As a result, each former stockholder of USN became the owner of an identical number of shares of capital stock of Holdings, evidencing the same proportional interests in Holdings and having the same designations, rights, powers and preferences, qualifications, limitations and restrictions, as those that the stockholder held in USN. Following the Merger, Holdings’ common stock continued to trade on the over-the-counter market and continued to be quoted on the OTC Markets under the same symbol, “USNU.” The conversion of shares of capital stock under the Merger Agreement occurred without an exchange of physical certificates. Accordingly, physical certificates formerly representing shares of outstanding capital stock of USN are deemed to represent the same number of shares of capital stock of Holdings. Pursuant to Section 251(g) of the DGCL, the provisions of the certificate of incorporation and bylaws of Holdings are substantially identical to those of USN prior to the date on which the Merger Agreement took effect. The authorized capital stock of Holdings, the designations, rights, powers and preferences of such capital stock, and the qualifications, limitations and restrictions thereof are also substantially identical to those of the capital stock of USN immediately prior to the date of the Merger. Further, the directors and executive officers of Holdings are the same individuals who were directors and executive officers, respectively, of USN immediately prior to the date of the Merger. Late in 2016, FOP took initial steps toward the development of a new radiation therapy center in Homestead, Florida. However, late in the third quarter of 2017, it was determined that the business opportunity at this new location should be pursued by a different investor group, and FOP arranged to sell the opportunity to this group. CB Oncology Partners, LLC (“CBOP”) was organized on September 1, 2017 to acquire the assets and rights in this new center from FOP. USNC owns a 24% interest in CBOP. In June 2017, FOP entered into an agreement with a third-party owner of a radiation therapy center located in Miami, Florida, whereby FOP took over the operation of the center effective September 22, 2017 for a ten-year initial term, and up to three additional terms of five years each. The Company, through the formation of noncontrolling interests in unconsolidated joint ventures, is currently exploring other opportunities for the establishment of cancer centers using IMRT and/or IGRT in Florida and other parts of the U.S.

Note A – Organization and Business

U.S. NeuroSurgical Holdings, Inc. owns and operates, through its wholly-owned subsidiaries, stereotactic radiosurgery centers, utilizing gamma knife technology, and holds other interests in radiological treatment facilities. As used herein, unless the context indicates otherwise, the term “Company”, “Registrant” and “Holdings” means U.S. NeuroSurgical Holdings, Inc. and its wholly-owned subsidiary, U.S. NeuroSurgical, Inc. (“USN”), and the wholly-owned subsidiaries of USN, U.S. NeuroSurgical Physics, Inc. and USN Corona, Inc.

U.S. NeuroSurgical, Inc. a Delaware corporation, was organized in July 1993 for the purpose of owning and operating stereotactic radiosurgery centers, utilizing the gamma knife technology. USN holds an interest in one gamma knife center on the premises of New York University Medical Center (“NYU”) in New York, New York. Management continues to explore opportunities to organize and participate in additional gamma knife centers. USN’s business strategy is to provide a mechanism whereby hospitals, physicians, and patients can have access to gamma knife treatment capability, a high capital cost item. USN provides the gamma knife to medical facilities on a “cost per treatment” basis. USN holds an interest in the gamma knife unit and is reimbursed by the facility where it is housed, based on utilization.

During the fourth quarter of 2007, USN formed a wholly-owned subsidiary, USN Corona, Inc. (“USNC”), to carry investments in Corona Gamma Knife, LLC and NeuroPartners, LLC. Those investments were formed to develop and manage a gamma knife center at San Antonio Regional Hospital in Upland, California. (See Note C[1])

During 2010, through the formation of a joint venture, in which it has a noncontrolling interest, the Company expanded its market strategy to include opportunities to develop cancer centers featuring radiation therapy. These centers utilize linear accelerators with IMRT (Intensity Modulated Radiation Therapy) and IGRT (Image Guided Radiation Therapy) capabilities. In 2010, the Company formed Florida Oncology Partners, LLC (“FOP”) in partnership with local physicians and other investors. USNC owns a 24% interest in the venture. FOP’s first center was located in Miami, Florida and opened in the second quarter of 2011. The Company entered into an arrangement to sell the center to 21^st Century Oncology in December 2015. The sale had not occurred as of December 31, 2018. (See Note C[2])

During 2011, the Company participated in the formation of Boca Oncology Partners RE, LLC (“BOPRE”), for the purpose of acquiring an interest in Boca West, IMP, LLC, (“Boca West, IMP”) which owns a medical office building. (See Note C[3]).

In 2015, Medical Oncology Partners LLC (“MOP”), was formed in partnership with local physicians and other investors. MOP was established to acquire a 100% equity interest in United Oncology Medical Associates of Florida, LLC (“UOMA”). USNC was not a member of MOP at the time of its formation, as it was not able to participate in MOP’s formation due to the fact that USNC was not a physician. An application was filed for a waiver and on December 22, 2016, USNC was cleared to become a part owner of MOP. USNC currently owns 35.83% of MOP. (See Note C[4])

On September 3, 2015, pursuant to the Agreement and Plan of Reorganization (the “Merger Agreement”), dated as of September 3, 2015, by and among USN, Holdings and U.S. NeuroSurgical Merger Sub, Inc. (“Merger Sub”), the Company adopted a new holding company organizational structure whereby USN is now a wholly owned subsidiary of Holdings. This structure did not result in any changes to the assets or operations of the Company, but management believes that it will create a more flexible framework for possible future transactions and organizational and operational adjustments.

The holding company organizational structure was effected by a merger (the “Merger”) conducted pursuant to Section 251(g) of the Delaware General Corporation Law (the “DGCL”), which provides for the formation of a holding company structure without a vote of the stockholders of the constituent corporations. Because the holding company organizational structure occurred at the parent company level, the remainder of the Company’s subsidiaries, operations and customers were not affected by this transaction.

In order to effect the Merger, USN formed Holdings as its wholly owned subsidiary and Holdings formed Merger Sub as its wholly owned subsidiary. Under the terms of the Merger Agreement, Merger Sub merged with and into USN, with USN surviving the merger and becoming a direct, wholly owned subsidiary of Holdings. Immediately prior to the Merger, Holdings had no assets, liabilities or operations.

Pursuant to the Merger Agreement, all of the outstanding capital stock of USN was converted, on a share for share basis, into capital stock of Holdings. As a result, each former stockholder of USN became the owner of an identical number of shares of capital stock of Holdings, evidencing the same proportional interests in Holdings and having the same designations, rights, powers and preferences, qualifications, limitations and restrictions, as those that the stockholder held in USN.

Following the Merger, Holdings’ common stock continued to trade on the over-the-counter market and continued to be quoted on the OTC Markets under the same symbol, “USNU.” The conversion of shares of capital stock under the Merger Agreement occurred without an exchange of physical certificates. Accordingly, physical certificates formerly representing shares of outstanding capital stock of USN are deemed to represent the same number of shares of capital stock of Holdings.

Pursuant to Section 251(g) of the DGCL, the provisions of the certificate of incorporation and bylaws of Holdings are substantially identical to those of USN prior to the date on which the Merger Agreement took effect. The authorized capital stock of Holdings, the designations, rights, powers and preferences of such capital stock, and the qualifications, limitations and restrictions thereof are also substantially identical to those of the capital stock of USN immediately prior to the date of the Merger. Further, the directors and executive officers of Holdings are the same individuals who were directors and executive officers, respectively, of USN immediately prior to the date of the Merger.

Late in 2016, FOP took initial steps toward the development of a new radiation therapy center in Homestead, Florida. However, late in the third quarter of 2017, it was determined that the business opportunity at this new location should be pursued by a different investor group, and FOP arranged to sell the opportunity to this group. CB Oncology Partners, LLC (“CBOP”) was organized on September 1, 2017 to acquire the assets and rights in this new center from FOP. USNC owns a 24% interest in CBOP.

In June 2017, FOP entered into an agreement with a third-party owner of a radiation therapy center located in Miami, Florida, whereby FOP took over the operation of the center effective September 22, 2017 for a ten-year initial term, and up to three additional terms of five years each.

The Company, through the formation of noncontrolling interests in unconsolidated joint ventures, is currently exploring other opportunities for the establishment of cancer centers using IMRT and/or IGRT in Florida and other parts of the U.S.