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Note 12 - Stock-based Compensation (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 02, 2006
Apr. 30, 2017
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Nov. 30, 2014
Mar. 31, 2014
Mar. 31, 2013
May 31, 2012
Nov. 30, 2010
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2011
Dec. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                           0 0 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value                           $ 256,000 $ 273,000 $ 274,000    
Allocated Share-based Compensation Expense                           614,000 302,000 267,000    
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense                           $ 231,000 $ 113,000 $ 103,000    
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic and Diluted                           $ 0.26   $ 0.02    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized                           $ 1,333,000        
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Diluted                             $ 0.03      
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic                             0.02      
Share Price                                   $ 34.43
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value                           $ 0 $ 6.07 $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value                           $ 82,000 $ 101,000 $ 940,000    
Proceeds from Stock Options Exercised                           123,000 $ 91,000 $ 236,000    
Amortization Year 2 [Member]                                    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized                           644,000        
Amortization, Year 3 [Member]                                    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized                           552,000        
Amortization, Year 4 [Member]                                    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized                           $ 137,000        
Restricted Stock [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage           20.00%                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           9,500               104,298        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value           $ 42.65               $ 16.38 [1]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value [1]                                  
Nonqualified Options [Member] | Key Employees [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                 104,000 50,000                
Share-based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period, Percentage                 20.00% 20.00%                
Nonqualified Options [Member] | Annual Grant to Non-employee [Member]                                    
Allocated Share-based Compensation Expense                     $ 70,000 $ 70,000 $ 70,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period                     614 325 175          
Performance Based Variable Nonqualified Stock Options [Member]                                    
Share-based Compensation Arrangement By Share-based Payment Award, Performance Awards Earned                                 4,442  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period                                 59,558  
Performance Based Variable Nonqualified Stock Options [Member] | Key Employees [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                   20.00%                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                   64,000                
The 2006 Stock Option Plan [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 750,000                                  
The 2014 Stock Option Plan [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant                           440,000        
The 2014 Stock Option Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   100,000   5,000                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 16.38   $ 30.81                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years                                
The 2014 Stock Option Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche One [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       25.00%                            
The 2014 Stock Option Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche Two [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       25.00%                            
The 2014 Stock Option Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche Three [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       25.00%                            
The 2014 Stock Option Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche Four [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       25.00%                            
The 2014 Stock Option Plan [Member] | Nonqualified Options [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                           0 0      
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Director [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     4,298 2,275 1,225   3,024                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 16.29 $ 30.80 $ 57.27   $ 19.88                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross               35,000                    
The 2014 Stock Option Plan [Member] | Minimum [Member] | Restricted Stock [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 85.00%                                  
The 2014 Stock Option Plan [Member] | Minimum [Member] | Nonqualified Options [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period                           5 years        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                           20.00%        
The 2014 Stock Option Plan [Member] | Maximum [Member] | Nonqualified Options [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period                           10 years        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                           25.00%        
[1] The weighted-average grant date fair value was based on the closing price of the Company's stock on the date of the grant.