CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 47,904	$ 45,570
Accounts receivable, net	11,605	8,747
Inventories, net	15,448	16,863
Deferred income taxes	2,444	2,444
Prepaid expenses and other	615	556
Total current assets	78,016	74,180
Other assets:
Goodwill	23,742	23,742
Other noncurrent	590	599
Total other assets	24,332	24,341
Property and equipment:
Land	4,928	4,928
Buildings	21,228	20,906
Equipment	63,120	61,835
Construction in progress	1,749	909
Property, Plant and Equipment, Gross, Total	91,025	88,578
Less accumulated depreciation	58,073	55,564
Net property and equipment	32,952	33,014
Total assets	135,300	131,535
Current liabilities:
Accounts payable and accrued liabilities	11,299	12,796
Income taxes payable to affiliates	290	433
Total current liabilities	11,589	13,229
Noncurrent liabilities:
Deferred income taxes	$ 7,041	$ 7,320
Stockholders' equity:
Preferred stock
Additional paid-in capital	$ 55,422	$ 55,342
Retained earnings	61,124	55,520
Total stockholders' equity	116,670	110,986
Total liabilities and stockholders’ equity	$ 135,300	$ 131,535
Commitments and contingencies (Note 1)
Class A Common Stock
Stockholders' equity:
Common stock	$ 24	$ 24
Total stockholders' equity	24	24
Class B Common Stock
Stockholders' equity:
Common stock	100	100
Total stockholders' equity	$ 100	$ 100