Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Allowances for accounts receivable	$ 1,549	$ 713
Reserves for inventory	59	104
Accumulated depreciation on depreciable assets	22,727	20,349
Accumulated amortization on other intangible assets	$ 120	$ 0
Stockholders' equity
Preferred stock, par value	$ 0.25	$ 0.25
Preferred stock, shares authorized	680,850	680,850
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.005	$ 0.005
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	10,054,466	10,056,650
Common stock, shares outstanding	9,654,328	9,625,728
Treasury stock, shares	347,840	346,119