Note 10 - Shareholders' Equity (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Note 10 - Shareholders' Equity (Details) [Line Items]
Stock Repurchased and Retired During Period, Shares	1,019,553		1,931,350
Payments for Repurchase of Common Stock (in Dollars)	$ 2,206,000		$ 3,134,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount (in Dollars)	1,389,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0		120,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	580,000		1,070,000		1,790,002
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			30,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%	[1]		[1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)	1,057,000		297,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)	70,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 9 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	490,000		765,002
Proceeds from Stock Options Exercised (in Dollars)	$ 775,000		$ 1,052,000
Granted in 2004 and 2005 [Member] | The 2004 Plan [Member]
Note 10 - Shareholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award	10 years
The 2004 Plan [Member]
Note 10 - Shareholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	5,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	3,230,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years

[1] The fair value calculation was based on the stock options granted during the year.