Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Derivative Contracts - Summary of Outstanding Derivative Contracts (Details)

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Note 12 - Derivative Contracts - Summary of Outstanding Derivative Contracts (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Interest rate swap $ 162,000 $ 180,900
Interest Rate Swap [Member]    
Interest rate swap 150,000 150,000
Commodity and Energy Derivative Contracts [Member]    
Interest rate swap 12,000 30,900
Notional amount - long 50,500 67,400
Notional amount - (short) (38,500) (36,500)
Metal Commodity Contract [Member]    
Interest rate swap 7,800 27,900
Energy Related Derivative [Member]    
Interest rate swap $ 4,200 $ 3,000