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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 49,664,762 $ 54,349,381
Marketable securities 19,513,639 16,686,136
Accounts receivable, net of allowances 3,970,942 6,017,201
Inventories 6,094,294 6,218,355
Other current assets 3,197,594 3,961,169
Total current assets 82,441,231 87,232,242
Property and equipment, net 1,055,677 1,188,914
Intangible assets, net 10,649,164 9,476,798
Other assets 1,319,538 695,777
Total assets 95,465,610 98,593,731
Current liabilities:    
Accounts payable 3,094,071 2,790,554
Other current liabilities 3,000,549 5,264,806
Total current liabilities 6,094,620 8,055,360
Revolving line of credit 5,859,951 4,359,951
Other long-term liabilities 637,671 611,933
Total liabilities 12,592,242 13,027,244
Commitments and contingencies      
Shareholders’ equity:    
Common stock—no par value; 100,000,000 shares authorized; 18,306,364 and 18,937,107 shares issued and outstanding as of June 30, 2013 and December 31, 2012, respectively 64,311,576 67,197,167
Retained earnings 18,714,845 18,499,154
Total shareholders’ equity 83,026,421 85,696,321
Noncontrolling interests (153,053) (129,834)
Total equity 82,873,368 85,566,487
Total liabilities and equity $ 95,465,610 $ 98,593,731