Note 2 - Accounting Policies - Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Weighted average number of common shares used for basic EPS (in shares)	31,130,222	32,345,382	33,150,949
Effect of dilutive stock options and restricted and deferred stock unit awards (in shares)	0	652,621	0
Weighted average number of common shares and dilutive potential common stock used for dilutive EPS (in shares)	31,130,222	32,998,003	33,150,949