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Note 9 - Stock Option Plans (Details) - Stock Option Transactions (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Option Transactions [Abstract]
Outstanding, beginning of year	2,148,170	2,186,511	2,068,063
Outstanding, beginning of year	$ 2.56	$ 2.28	$ 2.24
Granted	180,375	194,750	176,500
Granted	$ 8.36	$ 5.44	$ 2.96
Exercised	(890,033)	(191,585)	(18,427)
Exercised	$ 1.80	$ 2.20	$ 1.72
Forfeited	(29,684)	(40,751)	(24,625)
Forfeited	$ 4.88	$ 3.20	$ 2.76
Expired	(1,189)	(755)	(15,000)
Expired	$ 1.44	$ 1.76	$ 3.20
Outstanding, end of year	1,407,639	2,148,170	2,186,511
Outstanding, end of year	$ 3.80	$ 2.56	$ 2.28
Options exercisable, end of year	1,045,475	1,772,723	1,760,604
Options exercisable, end of year	$ 3.14	$ 2.28	$ 2.16

X

- Definition

The weighted average price at which option holders acquired shares when exercising their stock options into shares under the plan during the reporting period.

+ References

No definition available.

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- Definition

The weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired during the reporting period.

+ References

No definition available.

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- Definition

The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were forfeited during the reporting period due to noncompliance with plan terms during the reporting period.

+ References

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- Definition

The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options granted under the plan during the reporting period.

+ References

No definition available.

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- Definition

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.

+ 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)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

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.

+ References

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-Publisher FASB

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- Definition

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

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- Definition

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

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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

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-Number 210

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