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Note 7 - Shareholders' Equity (Detail) (USD $)
 1 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Jan. 31, 2011
Dec. 31, 2010
Mar. 31, 2008
Dec. 31, 2005
Mar. 31, 2013
Apr. 01, 2012
Dec. 31, 2012
Dec. 31, 2011
Jan. 03, 2011
Mar. 07, 2008
Dec. 19, 2005
Mar. 31, 2013
Stock Options [Member]
Apr. 01, 2012
Stock Options [Member]
Mar. 31, 2013
Restricted Stock [Member]
Apr. 01, 2012
Restricted Stock [Member]
Mar. 31, 2013
Long-Term Incentive Plan [Member]
Dec. 31, 2011
Long-Term Incentive Plan [Member]
Jun. 30, 2004
Long-Term Incentive Plan [Member]
Mar. 31, 2013
Incentive Stock Options [Member]
Minimum [Member]
Mar. 31, 2013
Incentive Stock Options [Member]
Maximum [Member]
Mar. 31, 2013
Non Qualified Stock Options [Member]
Minimum [Member]
Dec. 31, 2010
Option Grant 1 [Member]
Dec. 30, 2010
Option Grant 1 [Member]
Dec. 31, 2010
Option Grant 2 [Member]
Dec. 30, 2010
Option Grant 2 [Member]
Dec. 31, 2010
Option Grant 3 [Member]
Dec. 30, 2010
Option Grant 3 [Member]
Dec. 31, 2010
Option Grant 4 [Member]
Dec. 30, 2010
Option Grant 4 [Member]
Treasury Stock, Shares         1,372,757 1,372,757 1,372,757 1,372,757                                          
Treasury Stock, Value (in Dollars)         $ 7,658,000 $ 7,658,000 $ 7,658,000 $ 7,658,000                                          
Common Stock, Shares Authorized         40,000,000   40,000,000                   2,900,000 750,000                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years                                   3 years 5 years 3 years 4 years   4 years   4 years   4 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number         2,264,356   2,211,488                 2,166,356                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 50,000   50,000 48,000 114,000                                 50,000   250,000   200,000   200,000  
Share Price (in Dollars per share)                 $ 6.58 $ 12.74 $ 12.96                       $ 6.42   $ 6.42   $ 10.00   $ 15.00
Share Based Payment Award Options Annual Incremental Vesting 12,500                                         12,500   62,500   50,000   50,000  
Minimum Share Price Requirement (in Dollars per share)                                                     $ 10.00   $ 15.00
Number Of Days In Period Minimum Share Price Requirement                                                   15   15  
Number Of Days In Period Minimum Share Price Requirement Term                                                   30   30  
Share Based Payment Award Options Term   5                                                      
Share-based Compensation (in Dollars)         190,000 341,000           190,000 264,000 0 1,000                            
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)         0             1,060,000                                  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition         2 years 116 days                                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value (in Dollars)         1,000                                                
Proceeds from Stock Options Exercised (in Dollars)         12,000 99,000                                              
Stock Issued During Period, Value, Restricted Stock Award, Gross (in Dollars)                           $ 0 $ 0