Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 69,407	$ 89,042
Investments	72,045	69,972
Accounts receivable, net of reserves of $1,089 and $1,525 at June 30, 2019 and December 31, 2018, respectively	23,073	20,775
Inventories, net	22,986	21,300
Prepaid expenses and other current assets	2,413	1,854
Total current assets	189,924	202,943
Property and equipment, net	52,960	54,111
Operating lease right-of-use assets	23,495
Other long-term assets	4,884	4,897
Intangible assets, net	8,303	9,191
Goodwill	7,798	7,851
Total assets	287,364	278,993
Current liabilities:
Accounts payable	2,287	3,143
Accrued expenses and other current liabilities	8,101	8,146
Total current liabilities	10,388	11,289
Other long-term liabilities	373	550
Deferred tax liability	3,683	3,542
Operating lease liabilities	21,974
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock, $0.01 par value; 1,250 shares authorized, no shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively	0	0
Common stock, $0.01 par value; 90,000 shares authorized, 13,785 and 14,210 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively	138	142
Additional paid-in-capital	24,329	50,763
Accumulated other comprehensive loss	(5,696)	(5,526)
Retained earnings	232,175	218,233
Total stockholders’ equity	250,946	263,612
Total liabilities and stockholders’ equity	$ 287,364	$ 278,993