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Note 6 - Stock Option Plan (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
 
 
 
Weighted
 
 
Number
 
Average
 
 
of
 
Grant Date
 
 
Shares
 
Fair Value
 
 
 
 
 
Nonvested at January 1, 2018
 
 
10,500
 
 
$
24.50
 
Granted
 
 
20,000
 
 
$
37.42
 
Vested
 
 
4,200
 
 
$
26.04
 
Forfeited
 
 
-
 
 
 
-
 
 
 
 
 
 
 
 
 
 
Nonvested at September 30, 2018
 
 
26,300
 
 
$
34.08