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Note 7 - Shareholders' Equity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 48 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Nov. 30, 2012
Aug. 31, 2012
May 31, 2012
Feb. 29, 2012
Nov. 30, 2011
Aug. 31, 2011
May 31, 2011
Feb. 28, 2011
Jan. 31, 2011
Dec. 31, 2010
Jan. 31, 2009
Mar. 31, 2008
Jan. 31, 2008
May 31, 2006
Dec. 31, 2005
Dec. 31, 2012
Dec. 31, 2011
Jan. 03, 2011
Mar. 07, 2008
May 19, 2006
Dec. 19, 2005
Dec. 31, 2012
Incentive Stock Options [Member]
Long-Term Incentive Plan [Member]
Minimum [Member]
Dec. 31, 2012
Incentive Stock Options [Member]
Long-Term Incentive Plan [Member]
Maximum [Member]
Dec. 31, 2012
Non Qualified Stock Options [Member]
Long-Term Incentive Plan [Member]
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2011
Stock Options [Member]
Dec. 31, 2012
Market Performance Stock Options [Member]
Jan. 31, 2009
Time Vested Restricted Stock Awards [Member]
Dec. 31, 2012
Time Vested Restricted Stock Awards [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [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]
Dec. 31, 2012
Long-Term Incentive Plan [Member]
Jun. 30, 2004
Long-Term Incentive Plan [Member]
Preferred Stock, Shares Authorized                               1,000,000 1,000,000                                                
Preferred Stock, Par or Stated Value Per Share (in Dollars per share)                               $ 0.10 $ 0.10                                                
Preferred Stock, Shares Issued                               0 0                                                
Preferred Stock, Shares Outstanding                               0 0                                                
Common Stock, Shares Authorized                               40,000,000 40,000,000                                                
Common Stock, Par or Stated Value Per Share (in Dollars per share)                               $ 0.10 $ 0.10                                                
Stock Issued During Period, Shares, Issued for Services 25,758 24,311 17,473 16,271 17,350 15,981 17,036 11,276                                                                  
Stock Issued During Period, Value, Issued for Services (in Dollars) $ 77 $ 77 $ 77 $ 77 $ 76 $ 77 $ 76 $ 77                                                                  
Treasury Stock, Shares                               1,372,757 1,372,757                                                
Treasury Stock, Value (in Dollars)                               7,658 7,658                                                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                               2,911,723 2,939,723                                             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 Payment Award Term                                               3 years                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number                   1,794,694           2,211,488 2,356,228                                             2,113,488  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                 50,000     50,000     48,000 303,150 1,113,900                   0         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 days   30 days      
Share Based Payment Award, Options, Term                   5 years                                                              
Share-based Compensation (in Dollars)                               1,379 1,225               1,073 946       8 (27)                    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)                                                 817           0                    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition                                                 1 year 321 days                                
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Historical Rolling Average Forfeiture Rate, Term                               36 months                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)                               $ 1.67 $ 2.04                                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value (in Dollars)                               29 45                                                
Proceeds from Stock Options Exercised (in Dollars)                               114 73                                                
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Warrants Issued                           100,000                                                      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)                                       12.30                                          
Warrant Term                           5 years                                                      
Warrants Exercised During The Period                     10,000   82,000                                                        
Proceeds from Warrant Exercises (in Dollars)                     123   1,009                                                        
Warrants Expired During The Period             8,000                                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                               0 0                     16,286                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period                               1,218 4,925                       8,582                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                                 2,905                       7,704                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value (in Dollars)                                                           $ 5 $ 32