Note 2 - Summary of Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Weighted Average Number of Shares [Table Text Block]

	2012		2011		2010
Weighted average number of common shares used for basic EPS		39,222,737		39,362,138		39,040,386
Effect of dilutive stock options, restricted stock and deferred stock units (Note 7)		313,654		336,317		373,494
Weighted average number of common shares and dilutive potential common stock used in diluted EPS		39,536,391		39,698,455		39,413,880

Schedule of Equity Method Investments [Table Text Block]

Balance sheet data	2012		2011
Current assets	$	32,752	$	34,159
Non-current assets		22,495		22,209
Current liabilities		16,006		16,839
Non-current liabilities		484		518

Equity Method Investments Continued [Text Block]

Income statement data	2012		2011		2010
Revenues	$	141,233	$	134,716	$	134,884
Gross profit		40,342		29,651		36,095
Net income		22,009		12,512		19,497
Equity in earnings of affiliated companies		6,359		3,471		7,291

Balance Sheet Data for Consolidated Variable Interest Entities [Table Text Block]

Balance sheet data	2012		2011
Current assets	$	65,251	$	40,525
Non-current assets		47,086		19,005
Current liabilities		45,604		23,566
Non-current liabilities		23,169		14,573

Income Statement Data for Consolidated Variable Interest Entities [Table Text Block]

Income statement data	2012		2011		2010
Revenues	$	107,821	$	55,792	$	59,419
Gross profit		19,625		12,005		11,544
Net income		3,622		1,959		1,373