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Short-term and long-term debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Short-term debt:    
- Bank credit line $ 20,227 $ 6,056
- Long-term debt: current 346 264
Subtotal 20,573 6,320
Long-term debt:    
- Bank credit line 4,000 4,000
- Building and land mortgage 260 437
- Vehicle and equipment loans 145 172
- Capital lease obligations 234 44
- Less: current maturities (346) (264)
Subtotal 4,293 4,389
Total short-term & long-term debt $ 24,866 $ 10,709