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Note 13 - Net Income Per Common Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Net income		$ 40,653	$ 32,113
Basic (in shares)		5,702,539	5,671,838
Effect of dilutive equity awards (in shares)	[1]	40,109	59,063
Weighted average common shares outstanding - diluted (in shares)		5,742,648	5,730,901
Basic (in dollars per share)		$ 7.13	$ 5.66
Diluted (in dollars per share)		$ 7.08	$ 5.60
[1] Equity-based awards whose impact is considered to be anti-dilutive under the treasury stock method were excluded from the diluted net income per share calculation. The excluded number of anti-dilutive equity-based awards totaled 5,355 and 443 for the three months ended March 31, 2018 and 2017, respectively.

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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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