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Consolidated Condensed 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 $ 4,477 $ 7,655
Adjustments to reconcile net income to net cash provided by operating activities:    
Earnings from unconsolidated affiliates (443) (362)
Depreciation and amortization 5,383 4,573
Amortization of deferred loan costs 55 55
Foreign currency loss 390 74
Deferred income taxes 2,092 1,211
Gain on asset sales (111)  
Non-cash compensation cost 870 883
(Increase) decrease:    
Receivables 4,966 2,233
Inventory (334) (937)
Prepaid expenses and other current assets 359 (23)
Increase (decrease):    
Accounts payable (5,673) (4,380)
Other accrued liabilities (11,685) (5,262)
Income taxes (300) 905
Net cash provided by operating activities 46 6,625
Cash flows from investing activities:    
Capital expenditures (6,223) (5,729)
Business acquisitions, net of cash acquired (9,781) (2,697)
Proceeds from sale of assets 148  
Increase in other assets, net   (70)
Net cash used in investing activities (15,856) (8,496)
Cash flows from financing activities:    
Net borrowings under revolving credit agreement 14,870 1,050
Corporate tax effect from share-based payment arrangements (33) 436
Issuance of common stock from share-based payment arrangements 671 456
Payments related to withholding tax for share-based payment arrangements   (30)
Net cash provided by financing activities 15,508 1,912
Effect of exchange rate changes on cash (227) 196
Net (decrease) increase in cash and cash equivalents (529) 237
Cash and cash equivalents at beginning of period 34,201 22,477
Cash and cash equivalents at end of period $ 33,672 $ 22,714