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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Aug. 31, 2013
Aug. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 7,697 $ 6,700
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,029 1,626
Share based compensation 789 682
Excess income tax benefit from the exercise of stock options (1,585) (1,029)
Changes in operating assets and liabilities, net of business acquisitions:    
Accounts receivable (4,069) (1,790)
Inventories (3,207) 35
Prepaid expenses and other current assets (96) (1,136)
Accounts payable, accruals and other 3,950 (644)
NET CASH PROVIDED BY OPERATING ACTIVITIES 5,508 4,444
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment and other assets (2,041) (1,923)
Proceeds from the sale of marketable securities 25,732 18,428
Purchases of marketable securities (31,162) (28,847)
Acquisition of business (10,012) 0
NET CASH USED IN INVESTING ACTIVITIES (17,483) (12,342)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Increase (decrease) in other long-term liabilities 56 (287)
Net proceeds from issuance of common stock 3,806 2,494
Excess income tax benefit from the exercise of stock options 1,585 1,029
NET CASH PROVIDED BY FINANCING ACTIVITIES 5,447 3,236
EFFECT OF EXCHANGE RATE ON CASH 104 102
DECREASE IN CASH (6,424) (4,560)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 50,032 49,045
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 43,608 $ 44,485