Short-term and long-term debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Short-term debt:
- Bank credit line	$ 15,080	$ 12,451
- Long-term debt: current	287	285
Subtotal	15,367	12,736
Long-term debt:
- Bank credit line	4,000	4,000
- Building and land mortgage	603	764
- Vehicle and equipment loans	298	327
- Capital lease obligations	57	114
- Less: current maturities	(287)	(285)
Subtotal	4,671	4,920
Total short-term & long-term debt	$ 20,038	$ 17,656