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Note 6 - Stock Option Plan (Tables)
 6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
    Number
of
Shares		   Weighted
Average
Grant Date
Fair Value
         
Nonvested at January 1, 2016     18,000     $ 24.50  
Granted     -       -  
Vested     500     $ 24.50  
Forfeited     -       -  
                 
Nonvested at June 30, 2016     17,500     $ 24.50