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Note 17 - Stock-based Compensation Plan (Details) - Summary of Nonvested Restricted Sahres - Restricted Stock [Member]
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Note 17 - Stock-based Compensation Plan (Details) - Summary of Nonvested Restricted Sahres [Line Items]  
Granted | shares 19,500
Granted | $ / shares $ 24.50
Vested | shares (500)
Vested | $ / shares $ 24.50
Forfeited | shares (1,000)
Forfeited | $ / shares $ 24.50
Nonvested at end of year | shares 18,000
Nonvested at end of year | $ / shares $ 24.50