Note 2 - Summary of Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

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

	2011		2010		2009
Weighted average number of common shares used for basic EPS		39,362,138		39,040,386		37,134,295
Effect of dilutive stock options, restricted stock and deferred stock units (Note 7)		336,317		373,494		379,232
Weighted average number of common shares and dilutive potential common stock used in diluted EPS		39,698,455		39,413,880		37,513,527

Schedule of Equity Method Investments [Table Text Block]

Balance sheet data	2011		2010
Current assets	$	34,159	$	38,977
Non-current assets		22,209		22,279
Current liabilities		16,839		18,589

Equity Method Investments Continued [Text Block]

Income statement data	2011		2010		2009
Revenues	$	134,716	$	134,884	$	108,567
Gross profit		29,651		36,095		25,029
Net income		12,512		19,497		6,062
Equity in earnings of affiliated companies		3,471		7,291		1,192

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

Balance sheet data	2011		2010
Current assets	$	40,525	$	47,304
Non-current assets		19,005		18,529
Current liabilities		23,566		29,814

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

Income statement data	2011		2010		2009
Revenues	$	55,792	$	59,419	$	40,132
Gross profit		12,005		11,544		7,209
Net income		1,959		1,373		2,995