Note 1 - Basis of Presentation - Schedule of Antidilutive Securities (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Antidilutive securities excluded from calculation of earnings per share (in shares)	1,590,914	475,323	1,393,813	166,650
Restricted Stock Units (RSUs) [Member]
Antidilutive securities excluded from calculation of earnings per share (in shares)	1,561,852	418,924	1,361,077	166,650
Performance Shares [Member]
Antidilutive securities excluded from calculation of earnings per share (in shares)	29,062	56,399	32,736	0