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Note 6 - Shareholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 25, 2018
Jan. 03, 2011
Dec. 30, 2010
Jan. 31, 2018
Sep. 30, 2017
Jun. 30, 2014
Sep. 30, 2018
Jul. 02, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2014
Dec. 31, 2016
Jun. 30, 2004
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance                 1,576,087 1,860,211   2,323,581  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                 217,500 244,750      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price                 $ 9.68 $ 5.60      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options                 $ 521,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                 328 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value                 $ 4.22 $ 2.47      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value                 $ 1,722,000 $ 588,000      
Proceeds from Stock Options Exercised                 1,568,000 1,429,000      
Allocated Share-based Compensation Expense, Total                 890,000 653,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options                 $ 0 0      
Common Stock, Capital Shares Reserved for Future Issuance                 726,858        
Employee Stock Option [Member]                          
Allocated Share-based Compensation Expense, Total                 $ 817,000 642,000      
Employee Stock Option [Member] | President [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost               $ 193,000          
Restricted Stock [Member]                          
Allocated Share-based Compensation Expense, Total                 $ 73,000 11,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period         12,900                
Stock Repurchased During Period, Shares         3,959                
The 2004 Long-term Incentive Plan [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                 2,900,000       750,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance                 727,649        
The 2004 Long-term Incentive Plan [Member] | President [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     5 years                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   50,000                      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price   $ 6.58                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Incremental Vesting Shares   12,500                      
Option Accelerated Vesting, Stock Price Trigger $ 10                        
Option Accelerated Vesting, Threshold Trading Days 15 days                        
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost             $ 182,000            
The 2004 Long-term Incentive Plan [Member] | Options I [Member] | President [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     50,000                    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price     $ 6.42                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Incremental Vesting Shares     12,500                    
The 2004 Long-term Incentive Plan [Member] | Options II [Member] | President [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     250,000                    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price     $ 6.42                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Incremental Vesting Shares     62,500                    
The 2004 Long-term Incentive Plan [Member] | Options III [Member] | President [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     200,000                    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price     $ 10                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Incremental Vesting Shares     50,000                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Minimum Closing Share Price     $ 10                    
The 2004 Long-term Incentive Plan [Member] | Options IV [Member] | President [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     200,000                    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price     $ 15                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Incremental Vesting Shares     50,000                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Minimum Closing Share Price     $ 15                    
The 2004 Long-term Incentive Plan [Member] | Restricted Stock [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                     3 years    
Stock Issued During Period, Shares, Restricted Stock Award, Gross                     49,200    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value                     $ 3.24    
Allocated Share-based Compensation Expense, Total                   $ 11,000      
The 2014 Long-term Incentive Plan [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                 1,750,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance                 848,438        
The 2014 Long-term Incentive Plan [Member] | Awards Other than Stock Options and SARs [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           800,000              
The 2014 Long-term Incentive Plan [Member] | Restricted Stock [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years                  
Stock Issued During Period, Shares, Restricted Stock Award, Gross       17,500                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 7.16                  
Allocated Share-based Compensation Expense, Total                 $ 73,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options                 $ 52,000        
Incentive Stock Options [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           3 years              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period           7 years