Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

Summary of Valuation Allowance [Table Text Block]

Years ended December 31:	Beginning balance January 1,		Additional provisions to allowance		Write-offs and other deductions			Ending balance December 31,
2015	$	1,767	$	1,100	$	(1,010	)	$	1,857
2014	$	1,736	$	774	$	(743	)	$	1,767
2013	$	1,729	$	457	$	(450	)	$	1,736

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

(in thousands except per share data)
	2015		2014		2013
Numerator:
Net income	$	42,085	$	17,808	$	5,244
Denominator:
Denominator for basic income per share – weighted-average shares		18,145		15,250		14,837
Effect of dilutive securities:
Equivalent shares issuable upon conversion of unvested restricted shares		161		266		202
Equivalent shares issuable upon conversion of unvested employee stock options		5		1		-
Denominator for diluted income per share adjusted weighted-average shares and assumed conversions		18,311		15,517		15,039
Net income per share:
Basic income per share	$	2.32	$	1.17	$	0.35
Diluted income per share	$	2.30	$	1.15	$	0.35