Note 20 - Incentive Plans - Performance Shares Activity (Details) - Performance Shares [Member] - shares		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted stock outstanding as of January 1, (in shares)		235,950	197,249	202,754
Granted (1) (in shares)	[1]	297,450	135,780	100,170
Vested (in shares)	[2]	(100,170)	(97,079)	(105,675)
Restricted stock outstanding as of December 31, (in shares)		433,230	235,950	197,249

[1] The weighted-average grant date fair value for performance shares issued during the years ended December 31, 2018, 2017 and 2016 were $15.40, $23.35, and $28.60, respectively.

[2] For the years ended December 31, 2018, 2017 and 2016, the corresponding common stock equivalent of these vested awards were 0, 0 and 130,080, respectively.