THE COMPANY AND ITS SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
Dec. 31, 2012
THE COMPANY AND ITS SIGNIFICANT ACCOUNTING POLICIES [Abstract]
THE COMPANY AND ITS SIGNIFICANT ACCOUNTING POLICIES	Note B - The Company and its Significant Accounting Policies [1] Basis of presentation and consolidation The consolidated financial statements include the accounts of USN and its wholly-owned subsidiaries, U.S. NeuroSurgical Physics, Inc. and USNC. All significant intercompany balances and transactions have been eliminated in consolidation. [2] Cash and cash equivalents: The Company considers all highly liquid debt instruments purchased with a maturity of three months or less to be cash equivalents. [3] Investments in unconsolidated entities: The Company accounts for its investments in unconsolidated entities by the equity method. The Company records its share of such earnings (loss) in the Consolidated Statement of Operations as "Income (loss) from investments in unconsolidated entities". The carrying value of the Company's investments in unconsolidated entities is recorded in the Consolidated Balance Sheets. The Company records losses of the unconsolidated entities only to the extent of the Company's investment. As such, the recorded balances of Corona Gamma Knife, LLC, Neuro Partners, LLC and Boca Oncology Partners, LLC have been taken to zero. [4] Revenue recognition: Patient revenue is recognized when the gamma knife procedure is rendered. [5] Long-lived assets: The Company reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. [6] Depreciation and amortization: The gamma knives were being depreciated on the straight-line method over an estimated useful life of seven years. The related costs incurred to reload the cobalt were being amortized on a straight-line method over an estimated useful life of five years. Leasehold improvements were being amortized on the straight-line method over 7 to 20 years, the shorter of useful life, or the life of the leases. Office furniture and computers are being depreciated on the straight-line method over their estimated useful lives ranging from 3 to 7 years. Depreciation expense for 2012, 2011, and 2010, was $414,000, $637,000, and $829,000, respectively. Amortization expense for 2012, 2011, and 2010, was $12,000, $24,000, and $77,000, respectively. [7] Capital leases: Capital lease obligations are amortized ratably over the original term of the lease agreement, beginning with the earlier of the date the leased assets are placed in service or the effective date of the lease as defined in the lease agreement. [8] Income taxes: Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets or liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Valuation allowances are established when necessary to reduce tax assets to amounts more likely than not to be realized. [9] Earnings per share: Earnings per share are computed by dividing earnings available to common stockholders by the weighted average shares outstanding for the period. There were no common stock equivalents during 2012, 2011, and 2010, and therefore, no potential dilution for the periods presented. [10] Advertising costs: The Company follows the policy of charging the costs of advertising to expense as incurred. There were no advertising costs in 2012, 2011, and 2010. [11] Allowance for doubtful accounts: The Company evaluates each of its accounts receivable individually and provides a charge to income that is appropriate, in the opinion of management, to absorb probable credit losses. During 2011, the Company released $36,000 of allowance for doubtful accounts related to receivables that were subsequently collected. The Company considers all accounts receivable to be collectible at December 31, 2012 and 2011. [12] Estimates and assumptions: The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. [13] Fair values of financial instruments: The estimated fair value of financial instruments has been determined based on available market information and appropriate valuation methodologies. The carrying amounts of cash, accounts receivable, other current assets and accounts payable approximate fair value at December 31, 2012 and 2011 because of the short maturity of these financial instruments. The carrying values of the obligations under capital leases approximate fair value because the interest rates on these instruments approximate the market rates at December 31, 2012 and 2011. [14] Credit risk: At times, the Company may have cash and cash equivalents at a financial institution in excess of insured limits. The Company places its cash and cash equivalents with high credit quality financial institutions whose credit ratings are monitored by management to minimize credit risk. Accounts receivable consist primarily of amounts due from the medical centers. Historically, credit losses on accounts receivable have not been significant. [15] Asset retirement obligations: The Company records liabilities for legal obligations associated with the retirement of tangible long-lived assets based on the estimated fair value of such liabilities. The estimated costs of these obligations are capitalized as costs of the assets subject to the retirement obligations and amortized over the lives of the assets. [16] Reclassifications: Certain prior year balances have been reclassified to conform to current year presentation.

Note B - The Company and its Significant Accounting Policies

[1] Basis of presentation and consolidation

The consolidated financial statements include the accounts of USN and its wholly-owned subsidiaries, U.S. NeuroSurgical Physics, Inc. and USNC. All significant intercompany balances and transactions have been eliminated in consolidation.

[2] Cash and cash equivalents:

The Company considers all highly liquid debt instruments purchased with a maturity of three months or less to be cash equivalents.

[3] Investments in unconsolidated entities:

The Company accounts for its investments in unconsolidated entities by the equity method. The Company records its share of such earnings (loss) in the Consolidated Statement of Operations as "Income (loss) from investments in unconsolidated entities". The carrying value of the Company's investments in unconsolidated entities is recorded in the Consolidated Balance Sheets. The Company records losses of the unconsolidated entities only to the extent of the Company's investment. As such, the recorded balances of Corona Gamma Knife, LLC, Neuro Partners, LLC and Boca Oncology Partners, LLC have been taken to zero.

[4] Revenue recognition:

Patient revenue is recognized when the gamma knife procedure is rendered.

[5] Long-lived assets:

The Company reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable.

[6] Depreciation and amortization:

The gamma knives were being depreciated on the straight-line method over an estimated useful life of seven years. The related costs incurred to reload the cobalt were being amortized on a straight-line method over an estimated useful life of five years. Leasehold improvements were being amortized on the straight-line method over 7 to 20 years, the shorter of useful life, or the life of the leases. Office furniture and computers are being depreciated on the straight-line method over their estimated useful lives ranging from 3 to 7 years. Depreciation expense for 2012, 2011, and 2010, was $414,000, $637,000, and $829,000, respectively. Amortization expense for 2012, 2011, and 2010, was $12,000, $24,000, and $77,000, respectively.

[7] Capital leases:

Capital lease obligations are amortized ratably over the original term of the lease agreement, beginning with the earlier of the date the leased assets are placed in service or the effective date of the lease as defined in the lease agreement.

[8] Income taxes:

Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets or liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Valuation allowances are established when necessary to reduce tax assets to amounts more likely than not to be realized.

[9] Earnings per share:

Earnings per share are computed by dividing earnings available to common stockholders by the weighted average shares outstanding for the period. There were no common stock equivalents during 2012, 2011, and 2010, and therefore, no potential dilution for the periods presented.

[10] Advertising costs:

The Company follows the policy of charging the costs of advertising to expense as incurred. There were no advertising costs in 2012, 2011, and 2010.

[11] Allowance for doubtful accounts:

The Company evaluates each of its accounts receivable individually and provides a charge to income that is appropriate, in the opinion of management, to absorb probable credit losses. During 2011, the Company released $36,000 of allowance for doubtful accounts related to receivables that were subsequently collected. The Company considers all accounts receivable to be collectible at December 31, 2012 and 2011.

[12] Estimates and assumptions:

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

[13] Fair values of financial instruments:

The estimated fair value of financial instruments has been determined based on available market information and appropriate valuation methodologies. The carrying amounts of cash, accounts receivable, other current assets and accounts payable approximate fair value at December 31, 2012 and 2011 because of the short maturity of these financial instruments. The carrying values of the obligations under capital leases approximate fair value because the interest rates on these instruments approximate the market rates at December 31, 2012 and 2011.

[14] Credit risk:

At times, the Company may have cash and cash equivalents at a financial institution in excess of insured limits. The Company places its cash and cash equivalents with high credit quality financial institutions whose credit ratings are monitored by management to minimize credit risk. Accounts receivable consist primarily of amounts due from the medical centers. Historically, credit losses on accounts receivable have not been significant.

[15] Asset retirement obligations:

The Company records liabilities for legal obligations associated with the retirement of tangible long-lived assets based on the estimated fair value of such liabilities. The estimated costs of these obligations are capitalized as costs of the assets subject to the retirement obligations and amortized over the lives of the assets.

[16] Reclassifications:

Certain prior year balances have been reclassified to conform to current year presentation.