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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income: $ 2,338,236 $ 1,226,472
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 818,920 824,409
Stock-based compensation expense 250,071 240,873
Deferred tax expense (112,403)  
Provision for bad debts   8,036
Gain on bargain purchase   (314,244)
(Gain) loss on revaluation of contingent consideration (53,974) 24,629
Changes in assets and liabilities:    
Accounts receivable (2,772,175) (1,362,078)
Royalties and other receivables 5,284,800 126,252
Inventories 872,260 (54,782)
Prepaid expenses and other current assets (51,472) (293,908)
Accounts payable (548,648) 276,225
Accrued liabilities (1,301,152) 960,971
Long-term liabilities (1,129,760) 70,967
Net cash provided by operating activities 3,594,703 1,733,822
Cash flows from investing activities:    
Purchases of marketable securities (10,538,701) (14,612,493)
Redemptions of marketable securities 5,811,555 14,383,333
Purchases of property, plant and equipment (322,099) (156,742)
Net cash used in investing activities (5,049,245) (385,902)
Cash flows from financing activities:    
Exercise of stock options 956,721 113,540
Net cash provided by financing activities 956,721 113,540
Effect of exchange rate changes on cash and cash equivalents (141,985) 163,694
Net (decrease) increase in cash and cash equivalents (639,806) 1,625,154
Cash and cash equivalents, beginning of period 29,209,821 11,167,745
Cash and cash equivalents, end of period $ 28,570,015 $ 12,792,899