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Note 15 - Earnings Per Share - Computations of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income									$ 23,994	$ 38,899	$ 11,101
Basic (in shares)	5,975	6,034	6,159	6,168	6,219	6,326	6,381	6,399	6,083	6,331	6,627
Dilutive effect of common stock equivalents (in shares)									76	67	22
Diluted weighted average common shares outstanding (in shares)	6,029	6,088	6,229	6,264	6,312	6,373	6,430	6,425	6,159	6,398	6,649
Basic (in dollars per share)	$ 1.02	$ 1.53	$ 1.18	$ 0.22	$ 5.07	$ 0.54	$ 0.25	$ 0.36	$ 3.94	$ 6.14	$ 1.68
Diluted (in dollars per share)	$ 1.01	$ 1.52	$ 1.17	$ 0.22	$ 5	$ 0.54	$ 0.25	$ 0.36	$ 3.90	$ 6.08	$ 1.67

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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