Note 3 - Basic and Diluted Shares - Antidilutive Securities (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Basic and diluted (in shares)	18,982,871	18,928,999	18,968,176	18,903,643
Potentially dilutive (in shares)	27,500	26,873	27,500	26,873