Note 10 Employee Equity Incentive Plans (Policy)	12 Months Ended
Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation Plans Policy [Policy Text Block]	Stock-Based Compensation Plans We have employee equity incentive plans, which are described more fully in Note 10, “Employee Equity Incentive Plans.” The authoritative guidance provided by FASB requires employee stock options and rights to purchase shares under stock participation plans to be accounted for under the fair value method and requires the use of an option pricing model for estimating fair value. Accordingly, share-based compensation is measured at grant date, based on the fair value of the award and shares expected to vest. Compensation cost for equity incentive awards is based on the grant-date fair value estimated in accordance with the authoritative guidance provided by FASB. We use the straight-line attribution method to recognize share-based compensation costs over the service period of the award. The fair value of issuances under our Employee Stock Purchase Plan is estimated on the issuance date using the Black-Scholes options pricing model. Stock Purchase and Stock Option Plans The 2009 Equity Incentive Plan, the 2011 Equity Incentive Plan and the 2013 Equity Incentive Plan On September 10, 2009, our stockholders approved the 2009 Equity Incentive Plan, or the 2009 Plan, under which 900,000 shares of our common stock are reserved for the grant of stock options and other equity incentives. On September 16, 2011, our stockholders approved the 2011 Equity Incentive Plan, or the 2011 Plan, under which 600,000 shares of our common stock are reserved for the grant of stock options and other equity incentives. On August 30, 2013, our stockholders approved the 2013 Equity Incentive Plan, or the 2013 Plan, under which 2,000,000 shares of our common stock are reserved for the grant of stock options and other equity incentives. The 2009 Plan, the 2011 Plan and the 2013 Plan are referred to as the Plans. Stock Options Under the Plans, nonqualified and incentive stock options may be granted to employees, consultants and non-employee directors. Generally, the per share exercise price shall not be less than 100% of the fair market value of a share on the grant date. The Board of Directors has the full power to determine the provisions of each option issued under the Plans. While we may grant options that become exercisable at different times or within different periods, we have primarily granted options that vest over four years. The options, once granted, expire ten years from the date of grant. Stock Awards Stock awards, denominated restricted stock under the 2009 Plan and the 2011 Plan, may be granted to any employee, director or consultant under the Plans. Pursuant to a stock award, we will issue shares of common stock. Shares that are subject to the restriction will be released from restriction if certain requirements, including continued performance of services, are met. Stock Appreciation Rights Awards of stock appreciation rights, or SARs, may be granted to employees, consultants and nonemployee directors pursuant to the Plans. A SAR is payable on the difference between the market price at the time of exercise and the exercise price at the date of grant. In any event, the exercise price of a SAR shall not be less than 100% of the fair market value of a share on the grant date and shall expire no later than ten years from the grant date. Upon exercise, the holder of a SAR shall be entitled to receive payment either in cash or a number of shares by dividing such cash amount by the fair market value of a share on the exercise date. Restricted Stock Units Restricted stock units, denominated performance units in the 2009 Plan, may be granted to employees, consultants and nonemployee directors under the Plans. Each restricted stock unit shall have a value equal to the fair market value of one share. After the applicable performance period has ended, the holder will be entitled to receive a payment, either in cash or in the form of shares, based on the number of restricted stock units earned over the performance period, to be determined as a function of the extent to which the corresponding performance goals or other vesting provisions have been achieved. The 1999 Equity Incentive Plan and the 1999 Non-Employee Directors' Equity Incentive Plan Stock Options Prior to May 2009, stock options were granted under the 1999 Equity Incentive Plan and the 1999 Non-Employee Directors' Equity Incentive Plan, or the 1999 Plans, for not less than 85% of fair market value at the time of grant. Once granted, the options expire ten years from the date of grant. Options granted to employees under the 1999 Equity Incentive Plan typically vested over four years. The initial option grants under the 1999 Non-Employee Directors' Equity Incentive Plan typically vested over four years and subsequent annual grants vested over one year. The 1999 Plans expired in May 2009 and no additional grants may be made thereunder. Restricted Stock Units We granted restricted stock unit awards, or RSUs, under the 1999 Equity Incentive Plan. Pursuant to a RSU award, we delivered shares of our common stock if certain requirements, including continued performance of services, were met. All of the RSUs granted under the 1999 Equity Incentive Plan have vested or terminated. Zilog 2004 Omnibus Stock Incentive Plan The Zilog 2004 Omnibus Stock Incentive Plan, or the Zilog 2004 Plan, was approved by the stockholders of Zilog in 2004, and was amended and approved by the stockholders of Zilog in 2007. In connection with the acquisition of Zilog, our Board of Directors approved assumption of the Zilog 2004 Plan. Employees of Zilog and persons first employed by our company after the closing of the acquisition of Zilog were eligible to receive grants under the Zilog 2004 Plan. Under the 2004 Plan, non-statutory stock options were granted. At the time of the assumption of the Zilog 2004 Plan by our company, up to 652,963 shares of our common stock were available for grant under the plan. In general, the options and shares granted pursuant to the Zilog 2004 Plan are exercisable at such time or times, and subject to such terms and conditions (including the vesting schedule, period of exercisability and expiration date) as the plan administrator, generally the Compensation Committee of our Board of Directors, determined in the applicable option agreement. The exercise price per share, payable upon the exercise of an option, was established by such administrator at the time of the grant and is not less than the par value per share of common stock on the date of the grant and, in the case of an incentive stock option, generally is not less than 100% of the fair market value per share on the date of grant. The Zilog 2004 Plan expired in February 2014 and no additional grants may be made thereunder. Zilog 2002 Omnibus Stock Incentive Plan The Zilog 2002 Omnibus Stock Incentive Plan, or the Zilog 2002 Plan, was adopted in 2002. In connection with the acquisition of Zilog, our Board of Directors approved the assumption of the Zilog 2002 Plan with respect to the shares available for grant as stock options. Employees of Zilog and persons first employed by our company after the closing of the acquisition of Zilog were eligible to receive grants under the Zilog 2002 Plan. At the time of the assumption of the Zilog 2002 Plan by our company, up to 366,589 shares of our common stock were available for grant under the plan. Stock options granted under the Zilog 2002 Plan were permitted to be: (i) incentive stock options or nonqualified stock options or (ii) EBITDA-linked options and/or non-EBITDA linked options. We did not grant any EBITDA-linked options and none are outstanding. In general, non-EBITDA-linked options granted pursuant to the Zilog 2002 Plan was exercisable at such time or times and subject to such terms and conditions (including the vesting schedule, period of exercisability and expiration date) as determined by the plan administrator in the applicable award agreements or thereafter. The exercise price per share payable upon the exercise of an option was established by such administrator at the time of grant. The term of each non-EBITDA-linked option was determined at the time of grant and does not exceed ten years. The Zilog 2002 Plan expired in May 2012 and no additional grants may be made thereunder. Employee Stock Purchase Plan In May 1999, the Board of Directors approved the 1999 Employee Stock Purchase Plan, or the Purchase Plan, and reserved 500,000 shares of common stock for issuance under the Purchase Plan. Under the Purchase Plan, all eligible employees may purchase our common stock at a price equal to 85% of the lower of the fair market value at the beginning of the offer period or the semi-annual purchase date. Stock purchases are limited to 15% of an employee's eligible compensation.

Note 10 Employee Equity Incentive Plans (Policy)

12 Months Ended

Mar. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-based Compensation Plans Policy [Policy Text Block]

Stock-Based Compensation Plans

We have employee equity incentive plans, which are described more fully in Note 10, “Employee Equity Incentive Plans.” The authoritative guidance provided by FASB requires employee stock options and rights to purchase shares under stock participation plans to be accounted for under the fair value method and requires the use of an option pricing model for estimating fair value. Accordingly, share-based compensation is measured at grant date, based on the fair value of the award and shares expected to vest.

Compensation cost for equity incentive awards is based on the grant-date fair value estimated in accordance with the authoritative guidance provided by FASB. We use the straight-line attribution method to recognize share-based compensation costs over the service period of the award.

The fair value of issuances under our Employee Stock Purchase Plan is estimated on the issuance date using the Black-Scholes options pricing model.

Stock Purchase and Stock Option Plans

The 2009 Equity Incentive Plan, the 2011 Equity Incentive Plan and the 2013 Equity Incentive Plan

On September 10, 2009, our stockholders approved the 2009 Equity Incentive Plan, or the 2009 Plan, under which 900,000 shares of our common stock are reserved for the grant of stock options and other equity incentives. On September 16, 2011, our stockholders approved the 2011 Equity Incentive Plan, or the 2011 Plan, under which 600,000 shares of our common stock are reserved for the grant of stock options and other equity incentives. On August 30, 2013, our stockholders approved the 2013 Equity Incentive Plan, or the 2013 Plan, under which 2,000,000 shares of our common stock are reserved for the grant of stock options and other equity incentives. The 2009 Plan, the 2011 Plan and the 2013 Plan are referred to as the Plans.

Stock Options

Under the Plans, nonqualified and incentive stock options may be granted to employees, consultants and non-employee directors. Generally, the per share exercise price shall not be less than 100% of the fair market value of a share on the grant date. The Board of Directors has the full power to determine the provisions of each option issued under the Plans. While we may grant options that become exercisable at different times or within different periods, we have primarily granted options that vest over four years. The options, once granted, expire ten years from the date of grant.

Stock Awards

Stock awards, denominated restricted stock under the 2009 Plan and the 2011 Plan, may be granted to any employee, director or consultant under the Plans. Pursuant to a stock award, we will issue shares of common stock. Shares that are subject to the restriction will be released from restriction if certain requirements, including continued performance of services, are met.

Stock Appreciation Rights

Awards of stock appreciation rights, or SARs, may be granted to employees, consultants and nonemployee directors pursuant to the Plans. A SAR is payable on the difference between the market price at the time of exercise and the exercise price at the date of grant. In any event, the exercise price of a SAR shall not be less than 100% of the fair market value of a share on the grant date and shall expire no later than ten years from the grant date. Upon exercise, the holder of a SAR shall be entitled to receive payment either in cash or a number of shares by dividing such cash amount by the fair market value of a share on the exercise date.

Restricted Stock Units

Restricted stock units, denominated performance units in the 2009 Plan, may be granted to employees, consultants and nonemployee directors under the Plans. Each restricted stock unit shall have a value equal to the fair market value of one share. After the applicable performance period has ended, the holder will be entitled to receive a payment, either in cash or in the form of shares, based on the number of restricted stock units earned over the performance period, to be determined as a function of the extent to which the corresponding performance goals or other vesting provisions have been achieved.

The 1999 Equity Incentive Plan and the 1999 Non-Employee Directors' Equity Incentive Plan

Stock Options

Prior to May 2009, stock options were granted under the 1999 Equity Incentive Plan and the 1999 Non-Employee Directors' Equity Incentive Plan, or the 1999 Plans, for not less than 85% of fair market value at the time of grant. Once granted, the options expire ten years from the date of grant. Options granted to employees under the 1999 Equity Incentive Plan typically vested over four years. The initial option grants under the 1999 Non-Employee Directors' Equity Incentive Plan typically vested over four years and subsequent annual grants vested over one year. The 1999 Plans expired in May 2009 and no additional grants may be made thereunder.

Restricted Stock Units

We granted restricted stock unit awards, or RSUs, under the 1999 Equity Incentive Plan. Pursuant to a RSU award, we delivered shares of our common stock if certain requirements, including continued performance of services, were met. All of the RSUs granted under the 1999 Equity Incentive Plan have vested or terminated.

Zilog 2004 Omnibus Stock Incentive Plan

The Zilog 2004 Omnibus Stock Incentive Plan, or the Zilog 2004 Plan, was approved by the stockholders of Zilog in 2004, and was amended and approved by the stockholders of Zilog in 2007. In connection with the acquisition of Zilog, our Board of Directors approved assumption of the Zilog 2004 Plan. Employees of Zilog and persons first employed by our company after the closing of the acquisition of Zilog were eligible to receive grants under the Zilog 2004 Plan. Under the 2004 Plan, non-statutory stock options were granted. At the time of the assumption of the Zilog 2004 Plan by our company, up to 652,963 shares of our common stock were available for grant under the plan.

In general, the options and shares granted pursuant to the Zilog 2004 Plan are exercisable at such time or times, and subject to such terms and conditions (including the vesting schedule, period of exercisability and expiration date) as the plan administrator, generally the Compensation Committee of our Board of Directors, determined in the applicable option agreement. The exercise price per share, payable upon the exercise of an option, was established by such administrator at the time of the grant and is not less than the par value per share of common stock on the date of the grant and, in the case of an incentive stock option, generally is not less than 100% of the fair market value per share on the date of grant. The Zilog 2004 Plan expired in February 2014 and no additional grants may be made thereunder.

Zilog 2002 Omnibus Stock Incentive Plan

The Zilog 2002 Omnibus Stock Incentive Plan, or the Zilog 2002 Plan, was adopted in 2002. In connection with the acquisition of Zilog, our Board of Directors approved the assumption of the Zilog 2002 Plan with respect to the shares available for grant as stock options. Employees of Zilog and persons first employed by our company after the closing of the acquisition of Zilog were eligible to receive grants under the Zilog 2002 Plan. At the time of the assumption of the Zilog 2002 Plan by our company, up to 366,589 shares of our common stock were available for grant under the plan.

Stock options granted under the Zilog 2002 Plan were permitted to be: (i) incentive stock options or nonqualified stock options or (ii) EBITDA-linked options and/or non-EBITDA linked options. We did not grant any EBITDA-linked options and none are outstanding. In general, non-EBITDA-linked options granted pursuant to the Zilog 2002 Plan was exercisable at such time or times and subject to such terms and conditions (including the vesting schedule, period of exercisability and expiration date) as determined by the plan administrator in the applicable award agreements or thereafter. The exercise price per share payable upon the exercise of an option was established by such administrator at the time of grant. The term of each non-EBITDA-linked option was determined at the time of grant and does not exceed ten years. The Zilog 2002 Plan expired in May 2012 and no additional grants may be made thereunder.

Employee Stock Purchase Plan

In May 1999, the Board of Directors approved the 1999 Employee Stock Purchase Plan, or the Purchase Plan, and reserved 500,000 shares of common stock for issuance under the Purchase Plan. Under the Purchase Plan, all eligible employees may purchase our common stock at a price equal to 85% of the lower of the fair market value at the beginning of the offer period or the semi-annual purchase date. Stock purchases are limited to 15% of an employee's eligible compensation.