Note 3 - Shares - Basic and Diluted - Antidilutive Securities (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic and diluted (in shares)	19,281,035	19,180,735	19,267,909	19,163,022
Potentially dilutive (in shares)		2,500		11,389