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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income $ 6,542,044 $ 7,102,525
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,295,569 1,855,392
Stock-based compensation expense 1,686,926 852,637
Deferred tax expense 173,105 153,704
Loss on revaluation of contingent consideration 1,880,930 116,020
Loss on disposal of assets 1,156 2,640
Bad debt reserve 32,902  
Changes in assets and liabilities:    
Accounts receivable (6,853,392) (2,547,815)
Other receivables (283,478) 6,354,278
Inventories (2,380,129) (286,261)
Prepaid expenses and other current assets 981,580 (300,432)
Accounts payable 586,581 2,069,947
Accrued liabilities 874,652 (4,844,919)
Long-term liabilities (425,413) (207,390)
Net cash provided by operating activities 5,113,034 10,320,326
Cash flows from investing activities:    
Purchases of marketable securities (8,118,938) (18,635,241)
Redemptions of marketable securities 10,358,735 24,491,993
Acquisition of assets of Refine Technology, LLC   (21,235,937)
Increase in restricted cash   (250,000)
Purchases of property, plant and equipment (1,736,695) (1,224,091)
Net cash provided by (used in) investing activities 503,102 (16,853,276)
Cash flows from financing activities:    
Exercise of stock options 685,661 1,337,906
Payment of contingent considerations (99,000)  
Net cash provided by financing activities 586,661 1,337,906
Effect of exchange rate changes on cash and cash equivalents (1,553,773) (878,891)
Net increase (decrease) in cash and cash equivalents 4,649,024 (6,073,935)
Cash and cash equivalents, beginning of period 35,363,024 39,829,653
Cash and cash equivalents, end of period 40,012,048 33,755,718
Supplemental disclosure of non-cash investing activities:    
Income taxes paid $ 1,629,000 $ 668,000