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Note 17 - Stock-based Compensation (Details) - Changes in Shares Under Option Plans - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in Shares Under Option Plans [Abstract]
Beginning balance	759,683	503,834	722,155
Beginning balance	$ 11.36	$ 10.41	$ 10.18
Issued	5,000	21,000	5,800
Issued	$ 46.50	$ 32.77	$ 22.11
Assumed from
Virginia Heritage	0	401,497	0
Virginia Heritage	$ 0	$ 13.16	$ 0
Exercised	(443,912)	(157,313)	(198,588)
Exercised	$ 12.03	$ 14.71	$ 9.99
Forfeited	(12,380)	(8,110)	(2,420)
Forfeited	$ 29.58	$ 33.06	$ 7.40
Expired	(9,651)	(1,225)	(23,113)
Expired	$ 18.19	$ 9.00	$ 10.05
Ending balance	298,740	759,683	503,834
Ending balance	$ 9.97	$ 11.36	$ 10.41

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Number of share options (or share units) acquired in business combination.

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The weighted-average exercise price of stock options acquired in a business combination.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(4)
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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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