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Note 12 - Share-Based Payments (Details) - Stock Option Transactions (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Stock Option Transactions [Abstract]
Outstanding, beginning of period	1,052,308	2,117,121	1,407,639	2,148,170
Outstanding, beginning of period	$ 4.01	$ 2.84	$ 3.80	$ 2.56
Granted	98,100	22,500	98,100	142,876
Granted	$ 15.83	$ 8.92	$ 15.83	$ 7.88
Exercised	(134,199)	(733,843)	(474,220)	(877,986)
Exercised	$ 2.56	$ 1.56	$ 2.92	$ 1.64
Forfeited	(8,938)	(18,906)	(20,623)	(26,188)
Forfeited	$ 6.15	$ 4.88	$ 5.86	$ 4.84
Expired		(1,187)	(3,625)	(1,187)
Expired		$ 1.44	$ 3.36	$ 1.44
Outstanding, end of period	1,007,271	1,385,685	1,007,271	1,385,685
Outstanding, end of period	$ 5.34	$ 3.64	$ 5.34	$ 3.64
Options exercisable, end of period	732,683	1,049,810	732,683	1,049,810
Options exercisable, end of period	$ 3.84	$ 3.12	$ 3.84	$ 3.12

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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.

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Weighted average price of options that were either forfeited or expired.

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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 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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Number of share options (or share units) exercised during the current period.

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