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Note 13 - Income Taxes - Reconciliation of Statutory and Effective Tax Rates (Details)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
U.S. statutory rate		35.00%	35.00%	35.00%
State taxes		4.10%	4.10%	4.10%
Research and development credits		(1.40%)	(1.00%)	(2.30%)
Share-based compensation (1)	[1]	(1.40%)
Tax Act impact		(13.90%)
Other		(1.10%)	(1.30%)
Effective tax rate		21.30%	36.80%	36.80%
[1] With the adoption of ASU 2016-09 in the first quarter of 2017, excess tax benefits from equity awards are reflected within the provision for income taxes rather than within the consolidated balance sheet. For further information on the Company's adoption of ASU 2016-09, refer to Note 2, "Significant Accounting Policies - New Accounting Pronouncements" to the consolidated financial statements.

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The amount, expressed as a percentage, of the excess tax benefit related to share-based compensation/

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