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Note 9 - Stock-based Compensation (Details) (USD $)	1 Months Ended	12 Months Ended				12 Months Ended		1 Months Ended				1 Months Ended			12 Months Ended
	Nov. 30, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2010	Mar. 31, 2014 Employee Stock Option [Member] Minimum [Member]	Mar. 31, 2014 Employee Stock Option [Member] Maximum [Member]	Feb. 27, 2013 The 2006 Plan [Member]	Mar. 31, 2014 The 2006 Plan [Member]	Sep. 23, 2010 The 2006 Plan [Member]	Dec. 08, 2006 The 2006 Plan [Member]	Oct. 18, 2004 The 1999 Plan [Member]	Mar. 31, 2014 The 1999 Plan [Member]	Oct. 21, 1999 The 1999 Plan [Member]	Mar. 31, 2014 Minimum [Member]	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2012 Minimum [Member]	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2013 Maximum [Member]	Mar. 31, 2012 Maximum [Member]
Note 9 - Stock-based Compensation (Details) [Line Items]
Share Based Compensation Arrangements by Share Based Payment Award Exercise Price of Option Granted as Percentage of Bid Price of Underlying Shares		100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period						5 years	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period															4 years			7 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized										800,000	400,000			300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		398,172	416,125	433,785	443,642				385,897				12,275
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized								400,000				200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)		$ 6,287,000	$ 2,742,000	$ 2,228,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)		4,401,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		210,888
Share-based Compensation Arrangement by Share Based Payment Award, Number of Nonvested Options Modified	14,400
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	10 years														5 years	5 years	5 years	10 years	10 years	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost (in Dollars)			$ 240,000

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Represents the number of shares reserved for issuance under the option agreements awarded under the plan that are unvested and modified as a part of severance.

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Represents the exercise price of option granted under the share-based compensation plan as a percentage of bid price of the underlying shares at the date of grant.

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Unrecognized cost of unvested share-based compensation awards.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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