Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Non-controlling Interest [Member]
Beginning Balance at Dec. 31, 2011	$ 99,676	$ 169	$ 55,071	$ 27,612	$ 16,824
Beginning Balance, Shares at Dec. 31, 2011		16,949
Net income	24,268			24,268
Stock option expense	1,093		1,093
Shares issued for option exercises	22		22
Shares issued for option exercises, Shares		17
Restricted stock compensation expense	695	1	694
Restricted Stock compensation expense, Shares		78
Foreign currency translation gain (loss)	2,806				2,806
Ending Balance at Dec. 31, 2012	128,560	170	56,880	51,880	19,630
Ending Balance, Shares at Dec. 31, 2012		17,044
Net income	17,178			17,178
Dividends declared	(3,129)			(3,129)
Stock option expense	1,437		1,437
Shares issued for option exercises	4,013	4	4,009
Shares issued for option exercises, Shares		496
Restricted stock compensation expense	802	2	800
Restricted Stock compensation expense, Shares		90
Foreign currency translation gain (loss)	3,899				3,899
Ending Balance at Dec. 31, 2013	152,760	176	63,126	65,929	23,529
Ending Balance, Shares at Dec. 31, 2013		17,630
Net income	8,217			8,217
Dividends declared	(5,131)			(5,131)
Stock option expense	1,274		1,274
Shares issued for option exercises	1,671	2	1,669
Shares issued for option exercises, Shares	158	152
Shares issued for acquisition	31,717	11	31,706
Shares issues for acquisition, Shares		1,087
Restricted stock compensation expense	1,321	1	1,320
Restricted Stock compensation expense, Shares		114
Non-controlling interest	32					32
Foreign currency translation gain (loss)	(17,731)				(17,731)
Change in fair value of interest rate hedge	(431)				(431)
Ending Balance at Dec. 31, 2014	$ 173,699	$ 190	$ 99,095	$ 69,015	$ 5,367	$ 32
Ending Balance, Shares at Dec. 31, 2014		18,983