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Note 15 - Stock Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
   
RSUs
    
Weighted Average
Grant Date
Fair Value
  
Outstanding at December 31, 2017
    
98,943
     $
4.51
  
Granted
    
34,755
     $
13.30
  
Vested
    
(67,386
 )   $
4.56
  
Forfeited or cancelled
    
—
     $
—
  
Outstanding at December 31, 2018
    
66,312
     $
9.06
  
   
RSUs
    
Weighted Average
Grant Date
Fair Value
  
Outstanding at December 31, 2018
    
66,312
     $
9.06
  
Granted
    
—
     $
—
  
Vested
    
(36,847
 )   $
5.68
  
Forfeited or cancelled
    
(11,817
 )   $
13.30
  
Outstanding at December 31, 2019
    
17,648
     $
13.30
  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
ISOs and NQ
S
tock
O
ptions
    
Weighted Average
Grant Date
Fair Value
  
Outstanding at December 31, 2018
    
50,000
     $
16.97
  
Granted
    
—
     $
—
  
Vested
    
(10,000
 )   $
16.97
  
Forfeited or cancelled
    
—
     $
—
  
Outstanding at December 31, 2019
    
40,000
     $
16.97