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Note 15 - Share-based Payments (Details) - Stock Option Transactions - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Stock Option Transactions [Abstract]
Outstanding, beginning of period	943,323	1,107,257	976,062	1,407,639
Outstanding, beginning of period	$ 6.23	$ 3.97	$ 6.23	$ 3.80
Granted			45,000
Granted			$ 19.41
Exercised	(112,656)	(48,108)	(187,653)	(340,021)
Exercised	$ 2.66	$ 2.72	$ 2.92	$ 3.06
Forfeited	(1,716)	(6,091)	(4,458)	(11,685)
Forfeited	$ 13.15	$ 5.71	$ 12.46	$ 5.64
Expired	(1,875)	(750)	(1,875)	(3,625)
Expired	$ 2.40	$ 3.20	$ 2.40	$ 3.36
Outstanding, end of period	827,076	1,052,308	827,076	1,052,308
Outstanding, end of period	$ 6.69	$ 4.01	$ 6.69	$ 4.01
Options exercisable, end of period	581,433	824,641	581,433	824,641
Options exercisable, end of period	$ 4.58	$ 3.34	$ 4.58	$ 3.34

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

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