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Note 14 - Employee Benefits - Activities Under All Plans (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Granted (in shares) 0 0  
Granted unvested options (in shares) 0 0  
Shares available for grant (in shares) 404,456    
Weighted average exercise price (in dollars per share) $ 11.21    
Unvested options (in shares) 11,410    
Unvested options, weighted average grant date fair value (in dollars per share) $ 4.04    
Unvested options (in shares) 11,410    
Shares available for grant (in shares) 404,456    
Weighted average exercise price (in dollars per share) $ 11.21    
Unvested options, weighted average grant date fair value (in dollars per share) $ 4.04    
Restricted Stock [Member]      
Unvested restricted shares outstanding (in shares) 14,564    
Unvested restricted shares outstanding (in shares) 14,564    
Employee Stock Option [Member]      
Options outstanding (in shares) 34,229    
Options outstanding (in shares) 34,229    
The 2009 Plan [Member]      
Shares available for grant (in shares) 0 54,876 96,341
Weighted average exercise price (in dollars per share) $ 9.25 $ 9.25 $ 4.77
Unvested options (in shares) 22,820 34,229 0
Vested (in shares) 0 0 0
Vested (in shares) 11,410 11,409 0
Unvested options vested (in shares) (11,410) (11,409) 0
Transferred to subsequent plan (in shares)   (43,712)  
Vested (in dollars per share) $ 4.04 $ 4.04  
Shares available for grant (in shares) 0 0 54,876
Weighted average exercise price (in dollars per share) $ 11.21 $ 9.25 $ 9.25
Unvested options (in shares) 11,410 22,820 34,229
Unvested options, weighted average grant date fair value (in dollars per share) $ 4.04 $ 4.04 $ 4.04
Unvested options (in shares) 11,410 34,229 0
Shares available for grant (in shares) 0 54,876 96,341
Weighted average exercise price (in dollars per share) $ 9.25 $ 9.25 $ 4.77
Unvested options, weighted average grant date fair value (in dollars per share) $ 4.04 $ 4.04 $ 4.04
The 2009 Plan [Member] | Granted January 26, 2016, First Grant [Member]      
Granted (in shares)     (4,087)
Granted (in shares)     0
Granted unvested options (in shares)     0
Granted (Year)     3 years
The 2009 Plan [Member] | Granted January 26, 2016, Second Grant [Member]      
Granted (in shares)     (34,229)
Granted (in shares)     34,229
Granted unvested options (in shares)     34,229
Granted (Year)     3 years
Granted (in dollars per share)     $ 11.21
Granted (in dollars per share)     $ 4.04
The 2009 Plan [Member] | Granted April 26, 2016 [Member]      
Granted (in shares)     (3,149)
Granted (in shares)     0
Granted unvested options (in shares)     0
Granted (Year)     1 year
The 2009 Plan [Member] | Granted January 31, 2017 [Member]      
Granted (in shares)   (11,164)  
Granted (Year)   3 years  
The 2009 Plan [Member] | Restricted Stock [Member]      
Unvested restricted shares outstanding (in shares) 14,881 20,596 38,886
Vested (in shares) (7,541) (15,018) (24,320)
Transferred to subsequent plan (in shares)   0  
Unvested restricted shares outstanding (in shares) 7,340 14,881 20,596
Vested (in shares) (7,541) (15,018) (24,320)
Unvested restricted shares outstanding (in shares) 7,340 20,596 38,886
The 2009 Plan [Member] | Restricted Stock [Member] | Granted January 26, 2016, First Grant [Member]      
Granted (in shares)     3,406
The 2009 Plan [Member] | Restricted Stock [Member] | Granted January 26, 2016, Second Grant [Member]      
Granted (in shares)     0
The 2009 Plan [Member] | Restricted Stock [Member] | Granted April 26, 2016 [Member]      
Granted (in shares)     2,624
The 2009 Plan [Member] | Restricted Stock [Member] | Granted January 31, 2017 [Member]      
Granted (in shares)   9,303  
The 2009 Plan [Member] | Employee Stock Option [Member]      
Options outstanding (in shares) 49,229 49,229 15,000
Vested (in shares) 0 0 0
Unvested options vested (in shares) 0 0 0
Transferred to subsequent plan (in shares)   0  
Options outstanding (in shares) 34,229 49,229 49,229
Options outstanding (in shares) 49,229 49,229 15,000
The 2009 Plan [Member] | Employee Stock Option [Member] | Granted January 26, 2016, First Grant [Member]      
Granted (in shares)     0
Granted unvested options (in shares)     0
The 2009 Plan [Member] | Employee Stock Option [Member] | Granted January 26, 2016, Second Grant [Member]      
Granted (in shares)     34,229
Granted unvested options (in shares)     34,229
The 2009 Plan [Member] | Employee Stock Option [Member] | Granted April 26, 2016 [Member]      
Granted (in shares)     0
Granted unvested options (in shares)     0
The 2009 Plan [Member] | Employee Stock Option [Member] | Granted January 31, 2017 [Member]      
Granted (in shares)   0  
Granted unvested options (in shares)   0  
The 2017 Plan [Member]      
Shares available for grant (in shares) 415,292 375,000  
Vested (in shares) (2,280)    
Shares available for grant (in shares) 404,456 415,292 375,000
Options outstanding (in shares) 0    
Unvested options (in shares) 0    
Transferred from previous plan, effect on shares available for grant (in shares)   43,712  
Vested (in shares) (2,280)    
Unvested options (in shares) 0    
Shares available for grant (in shares) 415,292 375,000 375,000
Options outstanding (in shares) 0    
The 2017 Plan [Member] | Granted May 5, 2017 [Member]      
Granted (in shares)   (3,420)  
Granted (Year)   1 year  
The 2017 Plan [Member] | Granted January 23, 2018 [Member]      
Granted (in shares) (10,044)    
Granted (Year) 3 years    
The 2017 Plan [Member] | Granted April 24, 2018 [Member]      
Granted (in shares) (792)    
Granted (Year) 1 year    
The 2017 Plan [Member] | Restricted Stock [Member]      
Unvested restricted shares outstanding (in shares) 2,280 0  
Unvested restricted shares outstanding (in shares) 7,224 2,280 0
Transferred from previous plan (in shares)   0  
Unvested restricted shares outstanding (in shares) 7,224 0 0
The 2017 Plan [Member] | Restricted Stock [Member] | Granted May 5, 2017 [Member]      
Granted (in shares)   2,280  
The 2017 Plan [Member] | Restricted Stock [Member] | Granted January 23, 2018 [Member]      
Granted (in shares) 6,696    
The 2017 Plan [Member] | Restricted Stock [Member] | Granted April 24, 2018 [Member]      
Granted (in shares) 528    
The 2017 Plan [Member] | Employee Stock Option [Member]      
Options outstanding (in shares) 0 0  
Options outstanding (in shares) 0 0 0
Transferred from previous plan (in shares)   0  
Options outstanding (in shares) 0 0 0
The 2017 Plan [Member] | Employee Stock Option [Member] | Granted May 5, 2017 [Member]      
Granted (in shares)   0  
Granted unvested options (in shares)   0  
The 2017 Plan [Member] | Employee Stock Option [Member] | Granted January 23, 2018 [Member]      
Granted (in shares) 0    
Granted unvested options (in shares) 0    
The 2017 Plan [Member] | Employee Stock Option [Member] | Granted April 24, 2018 [Member]      
Granted (in shares) 0    
Granted unvested options (in shares) 0