Significant Accounting Policies (Schedule of Net Sales by Product Line) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Product Information [Line Items]
Net sales	$ 255,927	$ 202,643	$ 154,434
Stainless Steel [Member]
Product Information [Line Items]
Net sales	176,955	139,603	112,118
High-Strength Low Alloy Steel [Member]
Product Information [Line Items]
Net sales	21,617	15,693	13,180
Tool Steel [Member]
Product Information [Line Items]
Net sales	40,308	32,279	19,179
High-Temperature Alloy Steel [Member]
Product Information [Line Items]
Net sales	11,467	12,435	6,057
Conversion Services and Other Sales [Member]
Product Information [Line Items]
Net sales	$ 5,580	$ 2,633	$ 3,900