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Stock Plans Share-Based Payments (Details Narrative) (10Q) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted     1,143,034 2,311,542
Share-based compensation expense     $ 525 $ 456
Selling, general and administrative expense $ 1,503 $ 1,260 4,517 3,298
Income tax expenses benefit (93) $ (1,789)
Employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options 1,193   1,311  
Employee service share-based compensation, nonvested awards, compensation recognized at the time of certain performance conditions met 230   230  
Stock based compensation recognized amortization cost $ 963   $ 1,081  
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition 2 years   2 years 2 months 12 days  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted     449,043 817,144
Share-based compensation expense $ 15 112 $ 460 $ 316
Selling, general and administrative expense 14 100 416 264
Research and development expense $ 1 12 44 $ 52
Employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options     $ 87  
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition       6 months
Share based compensation unrecognized restricted stock award 15      
Unvested Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Research and development expense   2    
Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 143 130    
Selling, general and administrative expense 124 120    
Research and development expense $ 19 10    
Stock option modification expense   $ 12    
Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted 86,546      
Fair value of stock option granted $ 31