Note 9 - Senior Notes and Unsecured Revolving Credit Facility - Indebtedness (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
7.25% Senior Notes due 2022, net		$ 300,479	$ 304,832
Total Indebtedness		300,479	304,832
Revolving Credit Facility [Member]
Long-term Line of Credit, Total		0	0
Senior Notes Due 2022 [Member] | Senior Notes [Member]
7.25% Senior Notes due 2022, net	[1]	$ 300,479	$ 304,832

[1] The carrying value for the Senior Notes, as presented at March 31, 2020, is net of the unamortized discount of $1.0 million, unamortized premium of $0.8 million, and unamortized debt issuance costs of $2.6 million. The carrying value for the Senior Notes, as presented at December 31, 2019, is net of the unamortized discount of $1.1 million, unamortized premium of $0.9 million, and unamortized debt issuance costs of $3.0 million. The unamortized discount, unamortized premium and debt issuance costs are not factored into the estimated fair value.