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Note 12 - Stock Option Plans (Details) - Stock Option Transactions - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Option Transactions [Abstract]
Outstanding, beginning of year	976,062	1,407,639	2,148,170
Outstanding, beginning of year	$ 5.41	$ 3.80	$ 2.56
Granted	67,500	102,475	180,375
Granted	$ 21.26	$ 15.78	$ 8.36
Exercised	(517,998)	(502,061)	(890,034)
Exercised	$ 3.53	$ 2.95	$ 1.80
Forfeited	(10,323)	(28,366)	(29,684)
Forfeited	$ 13.30	$ 6.60	$ 4.88
Expired	(1,875)	(3,625)	(1,188)
Expired	$ 2.40	$ 3.36	$ 1.44
Outstanding, end of year	513,366	976,062	1,407,639
Outstanding, end of year	$ 9.24	$ 5.41	$ 3.80
Options exercisable, end of year	321,155	725,392	1,045,475
Options exercisable, end of year	$ 6.49	$ 4.03	$ 3.14

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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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