CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 37,591	$ 38,753
Accounts receivable, net	12,281	8,534
Inventories, net	15,875	13,235
Deferred income taxes	2,493	2,493
Prepaid expenses and other	462	596
Total current assets	68,702	63,611
Other assets:
Goodwill	23,742	23,742
Other noncurrent	549	573
Total other assets	24,291	24,315
Property and equipment:
Land	4,928	4,928
Buildings	20,714	20,523
Equipment	61,091	57,799
Construction in progress	598	2,588
Property, Plant and Equipment, Gross, Total	87,331	85,838
Less accumulated depreciation	53,805	52,086
Net property and equipment	33,526	33,752
Total assets	126,519	121,678
Current liabilities:
Accounts payable and accrued liabilities	10,906	9,705
Income taxes payable to affiliates	702	339
Other	8	6
Total current liabilities	11,616	10,050
Noncurrent liabilities:
Deferred income taxes	6,642	6,900
Stockholders' equity:
Preferred stock
Additional paid-in capital	55,342	55,265
Retained earnings	52,795	49,339
Total stockholders' equity	108,261	104,728
Total liabilities and stockholders’ equity	126,519	121,678
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