Note 9 - Employee Stock Option Plans (Details) - Stock Option Activity (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Option Activity [Abstract]
Options, Outstanding	349,983	461,919	495,517	695,000
Weighted average exercise price, Outstanding	$ 10.97	$ 9.80	$ 9.33	$ 8.33
Weighted average remaining contractual life, Outstanding	2 years 73 days	2 years 102 days	2 years 266 days	2 years 240 days
Average intrinsic value, Outstanding	$ 387,146
Vested at December 31, 2014	349,983
Vested at December 31, 2014	$ 10.97
Vested at December 31, 2014	2 years 73 days
Vested at December 31, 2014	$ 387,146
Options, Granted	43,064	46,402	40,517
Weighted average exercise price, Granted	$ 14.67	$ 10.64	$ 11.87
Options, Exercised	(155,000)	(45,000)	(240,000)
Weighted average exercise price, Exercised	$ 8.52	$ 6.70	$ 6.85
Forfeited/Expired		(35,000)
Forfeited/Expired		$ 8.20

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For presentations that combine terminations, 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 or that expired.

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

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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 remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 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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