Note 2 - Accounting Policies - Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Weighted average number of common shares used for basic EPS (in shares)	31,216,886	32,378,260	31,459,557	32,430,819
Effect of dilutive stock options and restricted and deferred stock unit awards (in shares)	0	628,600	0	668,426
Weighted average number of common shares and dilutive potential common stock used for dilutive EPS (in shares)	31,216,886	33,006,860	31,459,557	33,099,245