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Note 9 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended
	Jun. 30, 2018	Apr. 30, 2018	Mar. 31, 2019	Mar. 31, 2018
Proceeds from Issuance of Common Stock	$ 194,400	$ 168,700
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Net			732,000
Proceeds from Stock Options Exercised			$ 6,539	$ 4,202
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			$ 100,300
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			2 years 219 days
Common Stock [Member]
Stock Issued During Period, Shares, New Issues	5,100,000	6,900,000
Share Price	$ 39.50	$ 26
Payments of Stock Issuance Costs	$ 5,600	$ 10,700

X

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Number of share options (or share units) exercised during the current period, net of shares retained for cashless exercises.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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