Note 2 - Schedule of Adoption of New Revenue Standard Impacted the Consolidated Financial Statements - Income Statement (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 01, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Gross sales		$ 104,231	$ 112,233	$ 390,575	$ 350,431
Net revenue		104,618	112,619	397,761	352,179
Cost of goods sold		71,893	65,676	249,389	200,802
Gross profit		32,725	46,943	148,372	151,377
Operating profit		6,632	25,543	81,665	88,109
(Benefit)/provision for income taxes		(15,406)	7,498	(872)	22,484
Income from continuing operations		26,815	17,276	91,916	63,515
Net income		$ 26,729	$ 17,296	$ 91,206	$ 62,191
Income from continuing operations		$ 0.79	$ 0.52	$ 2.73	$ 1.90
Accounting Standards Updated 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Gross sales	$ 51,896	$ 1,914		$ 58,182
Net revenue		1,914		58,182
Cost of goods sold	31,347	8,475		33,194
Gross profit		(6,561)		24,988
Operating profit		(6,561)		24,988
(Benefit)/provision for income taxes	$ 4,330	(1,558)		5,076
Income from continuing operations		(5,003)		19,912
Net income		$ (5,003)		$ 19,912
Income from continuing operations		$ (0.15)		$ 0.59
Accounting Standards Updated 2014-09 [Member] | Amount Without Adoption of ASC 606 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Gross sales		$ 102,317		$ 332,393
Net revenue		102,704		339,579
Cost of goods sold		63,418		216,195
Gross profit		39,286		123,384
Operating profit		13,193		56,677
(Benefit)/provision for income taxes		(13,848)		(5,948)
Income from continuing operations		31,818		72,004
Net income		$ 31,732		$ 71,294
Income from continuing operations		$ 0.94		$ 2.14