Note 13 - Share-Based Compensation	6 Months Ended
Nov. 30, 2013
Share-based Arrangements with Employees and Nonemployees [Abstract]
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]	13. SHARE-BASED COMPENSATION The Company has granted nonvested restricted stock, stock options, and stock appreciation rights to key employees and directors under several stock award plans. The Company granted stock awards with an aggregate fair value of approximately $0.2 million and $0.3 million during the second quarter and six months ended November 30, 2013 and $0.5 million and $0.9 million during the second quarter and six months ended November 30, 2012, respectively. As of November 30, 2013, a total of 88,973 shares were available for future grants. Stock-based compensation is recognized on a straight-line basis over the requisite service period for restricted stock and stock option awards. The Company recognized expense of $0.4 million and $0.8 million in the three months and six months ended November 30, 2013 and $0.3 million and $0.9 million in the three months and six months ended November 30, 2012, respectively, before income tax benefits, for all of the Company’s stock plans. As of November 30, 2013, there was $4.3 million of total unrecognized compensation cost related the Company’s stock plans which will be recognized over approximately 2.9 years. As of November 30, 2013 there was no expense or liability recognized related to the stock appreciation rights granted as management has determined that a liquidity event (the performance condition) is not considered probable. The fair value of the liability relating to cash-settled stock appreciation rights was approximately $3.0 million as of November 30, 2013.

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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