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Note 1 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

June 30, 2020 (in thousands)		Level 1				Level 2			Level 3
Assets:
Investments:
Equity Funds – Held by Captive Insurance Company		$	1,450
Corporate Debt Securities – Held by Captive Insurance Company						$	3,062
Government-Backed and Government-Sponsored Enterprises’ Debt Securities – Held by Captive Insurance Company							5,960
Other Assets:
Money Market and Mutual Funds –Retirement Plans			1,560
Total Assets		$	3,010			$	9,022

December 31, 2019 (in thousands)		Level 1				Level 2			Level 3
Assets:
Investments:
Equity Funds – Held by Captive Insurance Company		$	1,586
Corporate Debt Securities – Held by Captive Insurance Company						$	2,124
Government-Backed and Government-Sponsored Enterprises’ Debt Securities – Held by Captive Insurance Company							6,060
Other Assets:
Money Market and Mutual Funds –Retirement Plans			2,363
Total Assets		$	3,949			$	8,184

Schedule of Inventory, Current [Table Text Block]

		June 30,				December 31,
(in thousands)		2020				2019
Finished Goods		$	26,190			$	31,863
Work in Process			14,418				16,508
Raw Material, Fuel and Supplies			49,146				49,480
Total Inventories		$	89,754			$	97,851

Schedule of Finite-Lived Intangible Assets [Table Text Block]

June 30, 2020 (in thousands)		Gross Carrying Amount				Accumulated Amortization				Net Carrying Amount				Remaining Amortization Periods (months)
Amortizable Intangible Assets:
Customer Relationships		$	22,491			$	11,820			$	10,671			82	-	182
Other			179				147				32			2	-	39
Total		$	22,670			$	11,967			$	10,703

December 31, 2019 (in thousands)		Gross Carrying Amount				Accumulated Amortization				Net Carrying Amount				Remaining Amortization Periods (months)
Amortizable Intangible Assets:
Customer Relationships		$	22,491			$	11,259			$	11,232			88	-	188
Other			179				121				58			8	-	45
Total		$	22,670			$	11,380			$	11,290

Finite-lived Intangible Assets Amortization Expense [Table Text Block]

		Three Months Ended								Six Months Ended
		June 30,								June 30,
(in thousands)		2020				2019				2020				2019
Amortization Expense – Intangible Assets		$	291			$	296			$	587			$	592

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

(in thousands)		2020				2021				2022				2023				2024
Estimated Amortization Expense – Intangible Assets		$	1,140			$	1,105			$	1,105			$	1,104			$	1,099

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

		As of June 30,
(in thousands)		2020				2019
Noncash Investing Activities:
Transactions Related to Capital Additions not Settled in Cash		$	61,925			$	16,841

Accounts Receivable, Allowance for Credit Loss [Table Text Block]

		Three Months Ended								Six Months Ended
		June 30,								June 30,
(in thousands)		2020				2019				2020				2019
Beginning Balance		$	1,681			$	1,533			$	1,339			$	1,407
Additions Charged to Expense (net of recoveries)			736				216				1,371				463
Reductions for Amounts Written Off			(317	)			(58	)			(610	)			(179	)
Ending Balance		$	2,100			$	1,691			$	2,100			$	1,691

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