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Note 9 - Share-based Payments (Details Textual) - USD ($)
12 Months Ended 13 Months Ended
Dec. 04, 2018
Feb. 21, 2018
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Mar. 01, 2017
Dec. 31, 2016
Dec. 12, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance     624,256 764,430     850,232  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 0 $ 3.31        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 0 $ 646,000        
Allocated Share-based Compensation Expense, Total     463,000 665,000        
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense     0 0        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options     $ 262,000          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year 62 days          
Stock Issued During Period, Value, Employee Stock Purchase Plan     $ 39,000 $ 66,000        
Stock Repurchase Program, Additional Authorized Amount           $ 10,000,000    
Stock Repurchased During Period, Shares       551,936 17,549      
Share Repurchase Program, Average Purchase Price Per Share       $ 9.28 $ 8.39      
Common Stock, Dividends, Per Share, Declared   $ 0.07            
Proceeds from Issuance of Common Stock $ 9,883,000   $ 9,883,000        
Shares Issued, Price Per Share $ 1.20              
Number of Shares, Oversubscribed 754,868              
Dividends Payable, Date to be Paid   Mar. 21, 2018            
Dividends Payable, Date of Record   Mar. 07, 2018            
Common Stock [Member]                
Stock Issued During Period, Shares, Employee Stock Purchase Plans     23,789 9,110        
Stock Issued During Period, Value, Employee Stock Purchase Plan            
Stock Repurchased During Period, Shares     17,549 551,936        
Stock Issued During Period, Shares, New Issues 8,306,535   8,306,535          
Directors and Officers [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years          
Other Employees [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years          
The 2007 Equity Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance     624,256          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares, Authorized and Unissued     870,838          
The 2007 Equity Incentive Plan [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years          
The 2007 Equity Incentive Plan [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years          
The 1998 Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares, Authorized and Unissued     0          
Employee Stock Purchase Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     500,000          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     442,994 466,783        
ESPP Participation Criteria, Maximum Percentage of Voting Power     5.00%          
Stock Issued During Period, Shares, Employee Stock Purchase Plans     23,789 9,110        
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent     85.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Discount on Purchase Price of Common Stock, Percent     15.00%          
Employee Stock Purchase Plan [Member] | Maximum [Member]                
Stock Issued During Period, Shares, Employee Stock Purchase Plans     2,500          
Stock Issued During Period, Value, Employee Stock Purchase Plan     $ 25,000