Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 141,797	$ 133,256
Investments	21,250	24,000
Accounts receivable, net of reserves of $2,180 and $1,914 at March 31, 2018 and December 31, 2017, respectively	18,289	23,825
Inventories, net	22,770	22,035
Prepaid expenses and other current assets	4,081	3,211
Total current assets	208,187	206,327
Property and equipment, net	55,772	56,183
Other long-term assets	1,247	1,254
Intangible assets, net	10,678	10,635
Goodwill	8,452	8,218
Total assets	284,336	282,617
Current liabilities:
Accounts payable	6,159	6,747
Accrued expenses and other current liabilities	7,963	6,326
Total current liabilities	14,122	13,073
Other long-term liabilities	1,150	660
Deferred tax liability	5,298	5,393
Commitments and contingencies (Note 12)
Stockholders’ equity:
Preferred stock, $.01 par value; 1,250 shares authorized, no shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	0	0
Common stock, $.01 par value; 60,000 shares authorized, 14,745 and 14,688 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	147	147
Additional paid-in-capital	74,958	68,617
Accumulated other comprehensive loss	(4,164)	(4,784)
Retained earnings	192,825	199,511
Total stockholders’ equity	263,766	263,491
Total liabilities and stockholders’ equity	$ 284,336	$ 282,617