Note 6 - Stockholders' Equity - Activity Under the Equity Incentive Plans (Details) - $ / shares shares in Thousands	3 Months Ended
Jun. 30, 2017	Jun. 30, 2017
Outstanding, beginning balance (in shares)	4,530
Outstanding, beginning balance (in dollars per share)	$ 3.02
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	65
Granted (in dollars per share)	$ 3.44
Exercised/Released (in shares)
Exercised/Released (in dollars per share)
Cancelled (in shares)	(21)
Cancelled (in dollars per share)	$ 3.95
Vested and expected to vest (in shares)		4,303
Outstanding, ending balance (in shares)	4,574
Outstanding, ending balance (in dollars per share)	$ 3.02
Vested and expected to vest (in dollars per share)		$ 3.07
Restricted Stock Units (RSUs) [Member]
Outstanding, beginning balance (in shares)	181
Outstanding, beginning balance (in dollars per share)	$ 3.94
Granted (in shares)
Granted (in dollars per share)
Exercised/Released (in shares)	(35)
Exercised/Released (in dollars per share)	$ 3.99
Cancelled (in shares)
Outstanding, ending balance (in shares)	181	146
Outstanding, ending balance (in dollars per share)	$ 3.93
Cancelled (in dollars per share)

The weighted average grant date fair value of restricted stock exercised in the period.

No definition available.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Number of non-option equity instruments exercised by participants.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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