Note 3 - Shares - Basic and Diluted - Antidilutive Securities (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic and diluted (in shares)	19,291,102	19,191,848	19,275,696	19,172,772
Potentially dilutive (in shares)		2,500		8,382