Note 2 - Accounting Policies - Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Weighted average number of common shares used for basic EPS (in shares)	30,726,566	31,216,886	30,721,684	31,459,557
Effect of dilutive stock options and restricted and deferred stock unit awards (in shares)	391,918	0	475,734	0
Weighted average number of common shares and dilutive potential common stock used for dilutive EPS (in shares)	31,118,484	31,216,886	31,197,418	31,459,557