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Note 12 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net, Total $ 0 $ 0  
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount $ 1,000   $ 1,200
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 205,000 69,000  
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total $ 700 $ 200  
Share-based Payment Arrangement, Expense 200 100  
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount $ 1,300    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years    
Restricted Stock [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year    
Restricted Stock [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Share-based Payment Arrangement, Option [Member]      
Share-based Payment Arrangement, Expense $ 200 $ 200  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years    
The 2014 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 2,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,796,770    
The Fourth Amended 2014 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 2    
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 78,169