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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Cash flows from operating activities:    
Net income $ 1,248 $ 3,702
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 12,161 6,273
Amortization of acquired inventory basis step-up 3,445  
Stock based compensation 2,375 1,877
Tax effect on exercise of stock options and issuance of performance shares (504) (198)
Deferred income taxes 2,175 1,058
Change in fair value of contingent consideration 197  
Change in accounts receivable allowances 6 205
Other (571) (37)
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable 1,497 (4,515)
Inventories (9,952) (1,546)
Prepaid expenses and other 299 (1,998)
Accounts payable and accrued liabilities (6,861) 892
Net cash provided by operating activities 5,515 5,713
Cash flows from investing activities:    
Additions to property, plant and equipment (4,787) (1,058)
Acquisition of business, net of cash acquired (13,908)  
Acquisition of intangible and other assets (400) (300)
Proceeds from disposal of intangible and other assets 801 1,000
Purchases of marketable securities (5,134) (77,652)
Proceeds from sale or maturity of marketable securities 16,989 69,275
Net cash used in investing activities (6,439) (8,735)
Cash flows from financing activities:    
Repayment of long-term debt (3,750) (135)
Proceeds from exercise of stock options and employee stock purchase plan 476 2,250
Repurchase and retirement of shares   (2,104)
Net cash (used in) provided by financing activities (3,274) 11
Effect of exchange rate changes on cash and cash equivalents 12 (18)
Decrease in cash and cash equivalents (4,186) (3,029)
Cash and cash equivalents at beginning of period 23,508 45,984
Cash and cash equivalents at end of period 19,322 42,955
Supplemental disclosure of non-cash, investing and financing activities:    
Contractual obligations in acquisition of fixed assets 2,509  
Contractual obligations in acquisition of intangibles and business $ 60,302