Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Allowances for accounts receivable	$ 476	$ 522
Reserves for inventory	32	112
Accumulated depreciation on depreciable assets	23,977	23,239
Accumulated amortization on other intangible assets	$ 643	$ 414
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	10,048,516	10,049,618
Common stock, shares outstanding	9,672,177	9,667,439
Treasury stock, shares	340,607	337,891