Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 7,102,525	$ 6,877,423
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	1,855,392	1,508,943
Stock-based compensation expense	852,637	562,762
Deferred tax expense	153,704	992,856
Loss (gain) on revaluation of contingent consideration	116,020	(18,587)
Loss on disposal of assets	2,640
Changes in assets and liabilities:
Accounts receivable	(2,547,815)	(814,837)
Royalties and other receivables	6,354,278	3,817,118
Inventories	(286,261)	360,872
Prepaid expenses and other current assets	(300,432)	(334,937)
Accounts payable	2,069,947	(958,014)
Accrued liabilities	(4,844,919)	592,030
Long-term liabilities	(207,390)	(194,945)
Net cash provided by operating activities	10,320,326	12,390,684
Cash flows from investing activities:
Purchases of marketable securities	(18,635,241)	(18,088,695)
Redemptions of marketable securities	24,491,993	13,383,003
Acquisition of assets of Refine Technology, LLC	(21,235,937)
Increase in restricted cash	(250,000)
Purchases of property, plant and equipment	(1,224,091)	(1,105,217)
Net cash used in investing activities	(16,853,276)	(5,810,909)
Cash flows from financing activities:
Exercise of stock options	1,337,906	2,034,545
Net cash provided by financing activities	1,337,906	2,034,545
Effect of exchange rate changes on cash and cash equivalents	(878,891)	(492,563)
Net (decrease) increase in cash and cash equivalents	(6,073,935)	8,121,757
Cash and cash equivalents, beginning of period	39,829,653	29,209,821
Cash and cash equivalents, end of period	33,755,718	37,331,578
Supplemental disclosure of non-cash investing activities:
Income taxes paid	$ 668,000	$ 771,000