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Note 13 - Stock-Based Compensation (Details) (USD $)	0 Months Ended	1 Months Ended		12 Months Ended			1 Months Ended		12 Months Ended					12 Months Ended
	Jun. 14, 2013	Jan. 31, 2013	May 19, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 31, 2013 Restricted Stock [Member]	Feb. 28, 2013 Restricted Stock [Member]	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2013 The 1998 Stock Option Plan [Member]	Dec. 31, 2013 The Fidelity Plans [Member]	Dec. 31, 2013 Minimum [Member] Pay Period [Member]	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2011 Minimum [Member]	Dec. 31, 2013 Minimum Hours Per Week [Member]	Dec. 31, 2013 Minimum Months Per Year [Member]	Dec. 31, 2013 Maximum [Member] Offering Period [Member]	Dec. 31, 2013 Maximum [Member] Annually [Member]	Dec. 31, 2011 Maximum [Member]	Dec. 31, 2013 Maximum [Member]
Note 13 - Stock-Based Compensation (Details) [Line Items]
undefined	10.00%			10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)				473,804								0	0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)				1,996,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)		3,300		3,300	5,500	4,950
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		10 years		7 years 6 months	7 years 6 months											6 years					7 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		5 years					4 years	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)							3,025	421,425	424,450	268,115
Number of Employees							8
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value				$ 10,200,000	$ 7,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				3,060,000	1,100,000	855,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value				133,000	136,000	151,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options				135,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				3 years 255 days					2 years 328 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in Shares)									614,580	348,353	222,793
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options									8,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in Shares)			550,000
Employee Stock Purchase Plan Percentage Of Market Value				85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period															1 year		20 hours	5 months
Amount Contributed To ESPP														10					6,250	25,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate																						10.00%
Allocated Share-based Compensation Expense				$ 3,304,000	$ 2,495,000	$ 1,077,000

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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 number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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