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Note 9 - Stock Option Plans (Details) (USD $)	12 Months Ended			9 Months Ended		1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 08, 2010 Employee Stock Option [Member] 2006 Equity Compensation Plan [Member]	Oct. 08, 2010 Non-Qualified Stock Options [Member] 2006 Equity Compensation Plan [Member]	Jul. 29, 2010 2006 Equity Compensation Plan [Member]	Dec. 31, 1996 2006 Equity Compensation Plan [Member]	Nov. 22, 2006 2006 Equity Compensation Plan [Member]
Note 9 - Stock Option Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)						1,725,000	2,787,500	1,250,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years			4 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in Shares)						475,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	4 years	4 years	4 years	7 years	5 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 900,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 328 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	1,100,000	296,000	25,000
Proceeds from Stock Options Exercised	1,492,174	418,108	31,346
Allocated Share-based Compensation Expense	$ 400,000	$ 400,000	$ 300,000

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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