CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 8,170,214	$ 16,093,155	$ 14,156,037
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,019,387	3,113,892	3,508,592
Stock-based compensation expense	1,766,532	1,059,806	1,024,152
Deferred tax expense (benefit)	295,095	2,787,967	(3,143,268)
Gain on bargain purchase			(314,244)
Loss on revaluation of contingent consideration	2,071,994	91,191	610,877
Gain on disposal of assets	35,028	1,836
Changes in assets and liabilities:
Accounts receivable	(1,596,803)	(773,954)	(1,211,343)
Royalties and other receivables	6,557,205	2,399,697	(5,923,675)
Inventories	(860,124)	(625,895)	2,734,239
Prepaid expenses and other current assets	(820,060)	57,604	30,266
Accounts payable	2,288,064	(733,728)	1,001,546
Accrued liabilities	(2,489,152)	1,256,736	2,083,964
Long-term liabilities	(1,036,082)	1,201,660	(1,110,791)
Net cash provided by operating activities	18,401,298	25,929,967	13,439,608
Cash flows from investing activities:
Purchases of marketable securities	(27,507,599)	(42,480,331)	(39,109,959)
Redemptions of marketable securities	34,803,854	29,208,818	43,214,487
Acquisition of assets of Refine Technology, LLC	(21,235,937)
Increase of restricted cash	(250,000)
Purchases of property, plant and equipment	(5,602,547)	(4,634,776)	(1,263,647)
Net cash provided by (used in) investing activities	(19,792,229)	(17,906,289)	2,840,881
Cash flows from financing activities:
Exercise of stock options	1,680,431	2,450,220	1,159,064
Excess tax benefit on exercise of stock options		71,964
Net cash provided by financing activities	1,680,431	2,522,184	1,159,064
Effect of exchange rate changes on cash and cash equivalents	(4,756,129)	73,970	602,523
Net increase (decrease) in cash and cash equivalents	(4,466,629)	10,619,832	18,042,076
Cash and cash equivalents, beginning of period	39,829,653	29,209,821	11,167,745
Cash and cash equivalents, end of period	35,363,024	39,829,653	29,209,821
Supplemental information:
Income taxes paid	2,547,000	1,264,000	140,000
Contingent Consideration
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on revaluation of contingent consideration	$ 2,071,994	$ 91,191	$ 604,133