Note 17 - Segment Information - Segment Reporting Information by Capital Expenditures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Capital expenditures	$ 10,165	$ 25,715	$ 10,160
Assets	649,555	760,740
Flat Products Segment [Member]
Capital expenditures	6,996	19,985	7,325
Assets	432,566	560,116
Tubular and Pipe Products [Member]
Capital expenditures	3,169	5,242	2,833
Assets	215,841	200,016
Corporate Segment [Member]
Capital expenditures		488	$ 2
Assets	$ 1,148	$ 608