CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Receivables, allowance for doubtful accounts	$ 272	$ 278
Shareholders' equity:
Common stock, no par value	$ 0	$ 0
Common stock, stated value	$ 0.10	$ 0.10
Common stock, authorized	100,000,000	100,000,000
Common stock, issued	13,552,582	13,519,131
Common stock, outstanding	13,552,582	13,519,131