Note 2 - Accounting Policies - Earnings Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Weighted average number of common shares used for basic EPS (in shares)	30,770,324	30,866,188	30,738,150	31,259,594
Effect of dilutive stock options and restricted and deferred stock unit awards (in shares)	0	511,244	0	0
Weighted average number of common shares and dilutive potential common stock used for dilutive EPS (in shares)	30,770,324	31,377,432	30,738,150	31,259,594