Note 6 - Stockholders' Equity - Basic and Diluted Earnings Per Share Calculation (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Weighted average shares outstanding for basic calculation (in shares)	34,030	14,510	22,322	14,504
Add: Effect of dilutive stock awards (in shares)			417	430
Weighted average shares outstanding, adjusted for diluted calculation (in shares)	34,030	14,510	22,739	14,934