Note 3 - Basic and Diluted Shares - Antidilutive Securities (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Basic and diluted (in shares)	19,022,403	18,914,307	18,983,049	18,935,635
Potentially dilutive (in shares)	27,500	25,281	27,500	25,281