Note 14 - Fair Value (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

	Fair Value at										Fair Value at
Asset / (Liability)	December 31, 2019										December 31, 2018
(dollars in thousands)	Level 1		Level 2			Level 3		Total			Level 1		Level 2			Level 3		Total
Commodity futures natural gas contracts	$	—	$	(839	)	$	—	$	(839	)	$	—	$	265		$	—	$	265
Interest rate swaps		—		(14,563	)		—		(14,563	)		—		(4,288	)		—		(4,288	)
Net derivative asset (liability)	$	—	$	(15,402	)	$	—	$	(15,402	)	$	—	$	(4,023	)	$	—	$	(4,023	)

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

		December 31, 2019				December 31, 2018
(dollars in thousands)	Fair Value Hierarchy Level	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Term Loan B	Level 2	$	375,800	$	304,398	$	380,200	$	362,141

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

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