Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Current assets    
Cash and cash equivalents $ 68,218,000 $ 47,653,000
Short-term marketable securities 39,028,000 33,201,000
Accounts receivable, net of allowance for doubtful accounts of $333 and $330 as of September 30, 2016 and December 31, 2015, respectively 37,261,000 36,125,000
Inventory 9,930,000 9,771,000
Prepaid expenses and other current assets 5,392,000 5,224,000
Income taxes receivable 6,028,000
Total current assets 159,829,000 138,002,000
Long-lived assets 142,722,000 125,475,000
Goodwill 28,916,000 28,916,000
Other intangible assets, net 2,817,000 3,337,000
Long-term marketable securities 68,387,000 64,789,000
Other long-term assets 1,374,000 517,000
Total assets 404,045,000 361,036,000
Current liabilities    
Accounts payable 10,703,000 13,643,000
Accrued compensation 10,330,000 9,993,000
Accrued liabilities and other 3,612,000 2,626,000
Income taxes payable 541,000
Total current liabilities 25,186,000 26,262,000
Long-term deferred tax liabilities 4,247,000 4,240,000
Other long-term liabilities 3,795,000 2,889,000
Total liabilities 33,228,000 33,391,000
Shareholders' equity    
Preferred stock, $0.001 par value, authorized 10,000,000 shares; issued and outstanding 0 shares as of each of September 30, 2016 and December 31, 2015
Common stock, $0.001 par value, authorized 150,000,000 shares; issued and outstanding 26,432,035 and 26,200,718 shares as of September 30, 2016 and December 31, 2015, respectively 26,000 26,000
Additional paid-in capital 210,226,000 198,835,000
Retained earnings 167,331,000 133,996,000
Accumulated other comprehensive loss (6,766,000) (5,212,000)
Total shareholders' equity 370,817,000 327,645,000
Total liabilities and shareholders' equity $ 404,045,000 $ 361,036,000