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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net income from continuing operations $ 14,074 $ 12,913
Adjustments to reconcile net income from continuing operations to net cash provided by continuing operations:    
Depreciation and amortization 2,736 2,863
Deferred tax expense (benefit) 796 (216)
Non-cash compensation 2,748 2,207
Changes in assets and liabilities:    
Accounts receivable, net 1,913 (6,382)
Inventories (1,661) (6,097)
Foreign sales tax receivable (363) 1,537
Other current assets (19) 44
Accounts payable (2,209) (4,042)
Income taxes payable (1,924) 572
Accrued expenses (18) 3,416
Current deferred compensation (1,825) 0
Deferred revenue (990) 1,406
Net cash provided by operating activities of continuing operations 13,258 8,221
Cash flows from investing activities of continuing operations:    
Purchase of Alfa & Ariss 0 (1,301)
Additions to property and equipment (838) (742)
Additions to intangible assets (233) (7,241)
Other assets 134 (146)
Net cash used in investing activities of continuing operations (937) (9,430)
Cash flows from financing activities of continuing operations:    
Proceeds from exercise of stock options 190 40
Net cash provided by financing activities of continuing operations 190 40
Cash flows used in discontinued operations:    
Net cash used in operating activities of discontinued operations (767) (545)
Net cash used in investing activities of discontinued operations 0 (5,761)
Net cash used in discontinued operations (767) (6,306)
Effect of exchange rates on cash (100) (564)
Net increase (decrease) in cash 11,644 (8,039)
Cash and equivalents, beginning of year 84,497 85,533
Cash and equivalents, end of period $ 96,141 $ 77,494