Note 1 - Basis of Presentation - Schedule of Antidilutive Securities (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Antidilutive securities excluded from calculation of earnings per share (in shares)	61,650	141,279
Restricted Stock Units (RSUs) [Member]
Antidilutive securities excluded from calculation of earnings per share (in shares)	61,650	141,279
Performance Shares [Member]
Antidilutive securities excluded from calculation of earnings per share (in shares)	0	0