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Note 3 - Antidilutive Securities (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Basic and diluted (in shares) 18,928,999 18,846,847 18,903,643 18,820,950
Potentially dilutive (in shares) 26,873 27,500 26,873 27,500