Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] | Note 1. Basis of Presentation In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all adjustments (consisting of normal recurring accruals and entries to record the impairment of the Company’s investment in equity securities) necessary to present fairly American Shared Hospital Services’ consolidated financial position as of June 30, 2016 and the results of its operations for the three and six month periods ended June 30, 2016 and 2015, which results are not necessarily indicative of results on an annualized basis. Consolidated balance sheet amounts as of December 31, 2015 have been derived from audited consolidated financial statements. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements for the year ended December 31, 2015 included in the Company’s 10-K filed with the Securities and Exchange Commission. These condensed consolidated financial statements include the accounts of American Shared Hospital Services (the “Company”) and its subsidiaries as follows: The Company wholly-owns the subsidiaries OR21, Inc. (“OR21 LLC”), MedLeader.com, Inc. (“MedLeader”), PBRT Orlando, LLC (“Orlando”) and American Shared Radiosurgery Services (“ASRS”). The Company is also the majority owner of Long Beach Equipment, LLC (“LBE”). ASRS is the majority-owner of GK Financing, LLC (“GKF”) which wholly-owns the subsidiaries GK Financing U.K., Limited (“GKUK”), and Instituto de Gamma Knife del Pacifico S.A.C. (“GKPeru”). GKF is also the majority-owner of the subsidiaries Albuquerque GK Equipment, LLC (“AGKE”) and Jacksonville GK Equipment, LLC (“JGKE”). The Company through its majority-owned subsidiary, GKF, provided Gamma Knife units to seventeen medical centers as of June 30, 2016 in the states of Arkansas, California, Oregon, Connecticut, Florida, Illinois, Massachusetts, Mississippi, Nevada, New Jersey, New Mexico, New York, Tennessee, Oklahoma, Ohio, Texas, and Washington. The Company through its wholly-owned subsidiary, Orlando, provided proton beam radiation therapy (“PBRT”) and related equipment, to a new customer in the United States, which treated its first patient during the second quarter of 2016. The Company also directly provides radiation therapy and related equipment, including Intensity Modulated Radiation Therapy (“IMRT”), Image Guided Radiation Therapy (“IGRT”) and a CT Simulator to the radiation therapy department at an existing Gamma Knife site in the United States. The Company formed the subsidiaries GKUK and GKPeru, for the purposes of expanding its business internationally into the United Kingdom and Peru; LBE and Orlando to provide proton beam therapy services in Long Beach, California and Orlando, Florida; and AGKE and JGKE to provide Gamma Knife services in Albuquerque, New Mexico and Jacksonville, Florida. AGKE began operation in the second quarter of 2011 and JGKE began operation in the fourth quarter of 2011. Orlando treated its first patient in April 2016. GKPeru is expected to begin operation in the second half of 2016. GKUK is inactive and LBE is not expected to generate revenue within the next two years. The Company continues to develop its design and business model for “The Operating Room for the 21st Century” SM SM 50 50 MedLeader was formed to provide continuing medical education online and through videos for doctors, nurses and other healthcare workers. This subsidiary is not operational at this time. Based on the guidance provided in accordance with Accounting Standards Codification (“ASC”) 280 Segment Reporting On January 14, 2016, the Company entered into a definitive lease agreement for financing of its MEVION S250 at UF Health Cancer Center at Orlando Health (“Orlando Health”). The proceeds of $ 8,200,000 8,400,000 1,000,000 7,100,000 1,137,000 Based on the guidance provided in accordance with ASC 405 Extinguishment of Liabilities Debt Modifications and Extinguishments 145,000 80,000 28,000 Based on guidance provided in ASC 320 InvestmentsDebt and Equity Securities Other Than Temporary Impairment (“OTTI”) of Certain Investments in Equity Securities 600,000 2,114,000 During the period ended December 31, 2015, the Company engaged a third party expert to review and corroborate its assessment of the fair value of the Mevion investment. Based on the third party analysis, an additional impairment loss of $ 26,000 579,000 2,140,000 Based on the guidance provided in ASC 410 Asset Retirement Obligations In May 2014, the Financial Accounting Standards Board “(FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers In August 2014, FASB issued ASU No. 2014-15, Disclosure of Uncertainties About an Entity’s Ability to Continue as a Going Concern In January 2015, the FASB issued ASU No. 2015-01, Income Statement-Extraordinary and Unusual Items (Subtopic 225-20): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items , Presentation of Financial Statements In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis In April 2015, the FASB issued ASU No. 2015-03, InterestImputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs The Company adopted ASU 2015-03 on January 1, 2016, on a retrospective basis. Debt issuance costs that were previously recorded as other assets on the Company’s condensed consolidated Balance Sheets were reclassified as an offset to the respective debt instrument for which they were derived. During the six month period ended June 30, 2016 and as of December 31, 2015, $ 67,000 72,000 In January 2016, the FASB issued ASU No. 2016-01 Recognition and Measurement of Financial Assets and Financial Liabilities In February 2016, the FASB issued ASU No. 2016-02 Leases In March 2016, the FASB issued ASU No. 2016-09 Compensation Stock Compensation (Topic 718) In June 2016, the FASB issued ASU No. 2016-13 Financial Instruments Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments As of June 30, 2016, the Company adopted a new accounting policy for the depreciation of PBRT property and equipment. Property and equipment are stated at cost less accumulated depreciation. Depreciation is determined using the modified units of production method, which is a function of both usage and time of the equipment. The estimated useful life of the PBRT unit in Orlando is 10 |