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Note 6 - Stock Option Plan (Details) - Nonvested Restricted Shares Activity - Restricted Stock [Member]
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Note 6 - Stock Option Plan (Details) - Nonvested Restricted Shares Activity [Line Items]  
Nonvested - Weighted number of shares | shares 0
Nonvested - Average grant date fair value $ 0
Granted | shares 19,500
Granted $ 24.50
Vested | shares 500
Vested $ 24.50
Forfeited | shares 1,000
Forfeited $ 24.50
Nonvested - Weighted number of shares | shares 18,000
Nonvested - Average grant date fair value $ 24.50