Note 2 - Stock-Based Compensation (Details) (USD $)	0 Months Ended		1 Months Ended		3 Months Ended		6 Months Ended		15 Months Ended	3 Months Ended		0 Months Ended	1 Months Ended	6 Months Ended		0 Months Ended	6 Months Ended	1 Months Ended			0 Months Ended	1 Months Ended	0 Months Ended	1 Months Ended	6 Months Ended
	Feb. 05, 2013	Feb. 14, 2012	Feb. 28, 2011	Feb. 25, 2010	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2013 Share Based Compensation [Member]	Jun. 30, 2012 Share Based Compensation [Member]	Feb. 05, 2013 Performance Based Restricted Stock Unit [Member]	Apr. 24, 2012 Performance Based Restricted Stock Unit [Member]	Jun. 30, 2013 Performance Based Restricted Stock Unit [Member]	Jun. 30, 2012 Performance Based Restricted Stock Unit [Member]	Feb. 05, 2013 Restricted Stock [Member]	Jun. 30, 2013 Restricted Stock [Member]	Apr. 24, 2012 Time Base Restricted Unit [Member]	Feb. 28, 2011 Time Base Restricted Unit [Member]	Feb. 28, 2011 CEO [Member]	Feb. 05, 2013 Executive Restricted Stock Unit [Member]	Feb. 28, 2011 Executive Restricted Stock Unit [Member]	Feb. 05, 2013 Nonexecutive Restrcted Stock Unit [Member]	Apr. 24, 2012 Nonexecutive Restrcted Stock Unit [Member]	Jun. 30, 2013 Employee Stock Option [Member]	Jun. 30, 2012 Employee Stock Option [Member]
Note 2 - Stock-Based Compensation (Details) [Line Items]
Income Tax Expense (Benefit)					$ (357,000)	$ 548,000	$ (562,000)	$ 857,000		$ 48,000	$ 11,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value					5,400,000	2,800,000	95,000,000,000	113,000,000,000																	10,900,000	5,500,000
Proceeds from Stock Options Exercised					6,300,000	3,400,000	5,500,000,000,000	7,300,000																	16,200,000
Intrinsic Value of Restricted Stock Units Released					2,900,000		11,500,000	4,400,000	2,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Intrinsic Value, Amount Per Share (in Dollars per share)														$ 42,800,000	$ 36,300,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options					69,000		69,000		69,000								24,300,000
Share Based Compensation Weighted Average Period Recognized																	2 years 36 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)		413,000		416,000															153,000					344,650
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed	300.00%											300.00%	300.00%							100.00%		300.00%
Performance Level RSU Reduction Percentage			15.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)	91,222												125,333			124,211		219,317			293,760		215,433
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 years															2 years		2 years			2 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options					900,000		900,000		900,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition							1 year 255 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate					0.00%	0.00%	0.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares)							65,247	97,247
Stock Issued During Period, Value, Employee Stock Purchase Plan							500,000	700,000
Proceeds from Stock Plans							$ 1,167,000	$ 1,036,000