CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 16,852	$ 23,589
Marketable securities	20,319	11,319
Trade accounts receivable, less allowance of $491 in 2013 and $592 in 2012	10,284	8,946
Inventories	14,963	15,382
Deferred income tax asset	997	1,008
Refundable income taxes		290
Prepaid expenses and other current assets	847	1,014
TOTAL CURRENT ASSETS	64,262	61,548
Property and equipment, net	31,785	32,370
Intangible assets, net	9,230	11,020
Deferred income tax asset - long-term	1,426	717
Other assets	70	70
TOTAL ASSETS	106,773	105,725
CURRENT LIABILITIES
Accounts payable	1,932	1,622
Accrued salaries, wages and payroll taxes	2,432	2,929
Income taxes payable	91
Other current liabilities	1,615	1,020
TOTAL CURRENT LIABILITIES	6,070	5,571
Long-term borrowings	22,000	22,000
Asset retirement obligations	904	871
Other long-term liabilities	274	356
TOTAL LIABILITIES	29,248	28,798
COMMITMENTS AND CONTINGENCIES
SHAREHOLDERS' EQUITY
Common stock, authorized 100,000 shares of $0.01 par value, issued 35,974 in 2013 and 34,829 in 2012	360	348
Additional paid-in capital	76,365	75,708
Retained earnings	11,183	11,232
Accumulated other comprehensive gain (loss)	(1)	21
Common stock in treasury, at cost - 4,762 shares	(10,382)	(10,382)
TOTAL SHAREHOLDERS' EQUITY	77,525	76,927
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 106,773	$ 105,725