Note 1 - Basis of Presentation - Schedule of Antidilutive Securities (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Antidilutive securities excluded from calculation of earnings per share (in shares)	1,546,018	210,135	1,288,649	48,535
Restricted Stock Units (RSUs) [Member]
Antidilutive securities excluded from calculation of earnings per share (in shares)	1,516,956	168,460	1,259,588	6,860
Performance Shares [Member]
Antidilutive securities excluded from calculation of earnings per share (in shares)	29,062	41,675	29,061	41,675