Note 16 - Weighted Average Shares Outstanding and Net Income (Loss) Per Share - Reconciliation of the Weighted Average Shares Outstanding in Basic and Diluted Net Loss per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net income (loss) allocated to common shareholders for basic calculation		$ 20,488	$ 55,672	$ (111,922)	$ 35,864
Effect of dilutive convertible notes		0	296	0	0
Net income (loss) allocated to common shareholders for basic calculation		$ 20,488	$ 55,968	$ (111,922)	$ 35,864
Weighted average common shares outstanding, basic (in shares)		46,788	46,308	46,771	42,443
Dilutive effect of RSUs and convertible notes (in shares)	[1],[2]	382	1,502	0	467
Weighted average common shares outstanding, diluted (in shares)		47,170	47,810	46,771	42,910
Net income (loss) per share, basic (in dollars per share)		$ 0.44	$ 1.20	$ (2.39)	$ 0.84
Net income (loss) per share, diluted (in dollars per share)		$ 0.43	$ 1.17	$ (2.39)	$ 0.84

[1] Due to the net loss for the nine months ended September 30, 2019, RSUs representing approximately 393,000 shares have been excluded from the number of shares used in calculating diluted net loss per share, as their inclusion would be antidilutive.

[2] Weighted average shares of approximately 1.1 million have been included in the number of shares used in calculating diluted net income per share for the three months ended September 30, 2018 based on the assumption that the 8% Convertible Notes were converted to Granite shares as of July 1, 2018 through their conversion on August 15, 2018. The shares have been excluded from the nine months ended September 30, 2018 as their inclusion would be antidilutive.