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Note 3 - Fair Value Measurements | 3 Months Ended
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Jun. 30, 2013
Fair Value Disclosures [Abstract] |
Fair Value Disclosures [Text Block] | NOTE C – FAIR VALUE MEASUREMENTS Nathan’s follows a three-level fair value hierarchy that prioritizes the inputs to measure fair value. This hierarchy requires entities to maximize the use of “observable inputs” and minimize the use of “unobservable inputs.” The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability on the measurement date. The three levels are defined as follows: ● Level 1 - inputs to the valuation methodology are quoted prices (unadjusted) for an identical asset or liability in an active market ● Level 2 - inputs to the valuation methodology include quoted prices for a similar asset or liability in an active market, quoted prices in markets that are not active, or model-derived valuations in which all significant inputs are observable for substantially the full term of the asset or liability ● Level 3 - inputs to the valuation methodology are unobservable and significant to the fair value measurement of the asset or liability The following table presents assets and liabilities measured at fair value on a recurring basis as of June 30, 2013 and March 31, 2013 based upon the valuation hierarchy (in thousands):
June 30, 2013 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Carrying Value |
Marketable securities |  | $ | - |  |  | $ | 11,399 |  |  | $ | - |  |  | $ | 11,399 |
Total assets at fair value |  | $ | - |  |  | $ | 11,399 |  |  | $ | - |  |  | $ | 11,399 |
March 31, 2013 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Carrying Value |
Marketable securities |  | $ | - |  |  | $ | 12,307 |  |  | $ | - |  |  | $ | 12,307 |
Total assets at fair value |  | $ | - |  |  | $ | 12,307 |  |  | $ | - |  |  | $ | 12,307 |
Nathan’s marketable securities, which consist primarily of municipal bonds, are not actively traded. The valuation of such bonds is based upon quoted market prices for similar bonds currently trading in an active market or model-derived valuations in which all significant inputs are observable for substantially the full term of the asset or liability. It was not practicable to estimate the fair value of the long-term investment representing 2.5% of the equity ownership of a privately-owned company; that investment is carried at its original cost, net of impairment charges, of $100,000 in the statement of financial position. At March 31, 2013, the total assets reported by the privately-owned company were $2,426,000, total equity was $1,817,000, total revenues for the quarter then-ended were $616,000 and net loss was $528,000. The carrying amounts of cash equivalents, accounts receivable and accounts payable approximate fair value due to the short-term maturity of the instruments. Certain non-financial assets and liabilities are measured at fair value on a nonrecurring basis; that is, the assets and liabilities are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances, such as when evidence of impairment exists. At June 30, 2013, no fair value adjustment or material fair value measurements were required for non-financial assets or liabilities.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13504-108611 + Details
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