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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 51,209,544 $ 54,349,381
Marketable securities 18,958,810 16,686,136
Accounts receivable, net of allowances 5,967,631 6,017,201
Inventories 5,992,031 6,218,355
Other current assets 3,892,239 3,961,169
Total current assets 86,020,255 87,232,242
Property and equipment, net 1,153,426 1,188,914
Intangible assets, net 10,403,974 9,476,798
Other assets 700,095 695,777
Total assets 98,277,750 98,593,731
Current liabilities:    
Accounts payable 3,427,256 2,790,554
Other current liabilities 4,808,531 5,264,806
Total current liabilities 8,235,787 8,055,360
Revolving line of credit 4,359,951 4,359,951
Other long-term liabilities 652,371 611,933
Total liabilities 13,248,109 13,027,244
Commitments and contingencies      
Shareholders’ equity:    
Common stock—no par value; 100,000,000 shares authorized; 18,549,749 and 18,937,107 shares issued and outstanding as of March 31, 2013 and December 31, 2012, respectively 65,818,995 67,197,167
Retained earnings 19,353,863 18,499,154
Total shareholders’ equity 85,172,858 85,696,321
Noncontrolling interests (143,217) (129,834)
Total equity 85,029,641 85,566,487
Total liabilities and equity $ 98,277,750 $ 98,593,731