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Note 12 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2008
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Aug. 31, 2017
Preferred Stock, Shares Authorized   5,000,000      
Preferred Stock, Shares Outstanding, Ending Balance   0      
Common Stock, Shares Authorized   50,000,000 50,000,000    
Retained Earnings (Accumulated Deficit), Ending Balance   $ (112,363) $ (104,842)    
Stock Repurchase Program, Authorized Amount, Additional         $ 10,000
Treasury Stock, Shares, Acquired   1,015,000 389,000 1,051,000  
Treasury Stock Acquired, Average Cost Per Share   $ 12.14 $ 11.55 $ 10.15  
Treasury Stock, Value, Acquired, Cost Method   $ 12,318 $ 4,490 $ 10,666  
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased   440,622      
Stock Issued During Period, Shares, Employee Stock Ownership Plan   848,000 890,000 1,409,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   54,000 78,000 64,000  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   5 years 335 days 4 years 80 days 5 years 182 days  
Allocated Share-based Compensation Expense, Total   $ 6,804 $ 5,861 $ 5,088  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number   1,599,000      
Share-based Compensation Arrangement by Share-based Payment Award, Average Forfeiture Rate   8.00%      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   $ 4,983      
Common Stock [Member]          
Treasury Stock, Shares, Acquired   1,015,000 389,000 1,051,000  
Treasury Stock, Value, Acquired, Cost Method   $ 1 [1] $ 1 [1]  
Share Price   $ 11.20 $ 12.50 $ 13.05  
1993 Director Stock Option Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   1,980,875      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   2,464,933      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance   165,000      
1998 Non-Officer Employee Stock Option Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   5,062,881      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   7 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance   14,583      
2012 Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   7 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   3,750,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance   786,031      
2012 Equity Incentive Plan [Member] | Non-employee Directors [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   8,000      
1993 Employee Stock Purchase Plan (ESPP) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award Options Grants in Period, Exercise Price Based on Percentage of Fair Market Value of Common Stock   85.00%      
Employee Stock Purchase Plan, Shares Reserved for Future Purchase   4,800,000      
Stock Issued During Period, Shares, Employee Stock Purchase Plans   230,000 227,000 233,000  
Employee Stock Ownership Plan (ESOP), Weighted Average Purchase Price of Shares Purchased   $ 8.71 $ 8.34 $ 7.62  
Employee Stock Purchase Plan (ESPP), Shares Reserved for Future Purchase, Remaining   479,000      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum   29.60% 27.42% 29.60%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum   32.88% 34.92% 41.21%  
Share-based Compensation Award, Tranche One [Member] | 1993 Director Stock Option Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   33.00%      
Share-based Compensation Award, Tranche Two [Member] | 1993 Director Stock Option Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   33.00%      
Share-based Compensation Award, Tranche Three [Member] | 1993 Director Stock Option Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   33.00%      
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   563,000 476,000 573,000  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance   946,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 11.25 $ 9.63 $ 8.33  
Share-based Compensation Arrangement by Share-based Payment Award, Weighted Average Pre Vest Cancel Rate   3.75% 3.64% 3.78%  
Restricted Stock Units (RSUs) [Member] | 2012 Equity Incentive Plan [Member] | Non-employee Directors [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   4,000      
Restricted Stock Units (RSUs) [Member] | Share-based Compensation Award, Vesting on the First Anniversary [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   25.00%      
Restricted Stock Units (RSUs) [Member] | Share-based Compensation Award, Vesting Each Quarter After First Anniversary [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   6.25%      
Stock Appreciation Rights (SARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   13,000 190,000  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance   185,000      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, In the Money, Number   154,000      
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 4.39 $ 2.95 $ 3.97  
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award Options Grants in Period, Exercise Price Based on Percentage of Fair Market Value of Common Stock   100.00%      
Minimum [Member] | 1993 Employee Stock Purchase Plan (ESPP) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   6 years      
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares to be Issued Upon Exercise of Outstanding Awards   1,738,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable, Number   667,000      
Maximum [Member] | 1993 Employee Stock Purchase Plan (ESPP) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   2 years      
Maximum [Member] | Stock Appreciation Rights (SARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant as Percentage of Company Outstanding Common Stock 50.00%        
[1] Represents an amount lower than $1.