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Note 1 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

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

September 30, 2020 (in thousands)		Level 1				Level 2			Level 3
Assets:
Investments:
Equity Funds – Held by Captive Insurance Company		$	1,665
Corporate Debt Securities – Held by Captive Insurance Company						$	2,887
Government-Backed and Government-Sponsored Enterprises’ Debt Securities – Held by Captive Insurance Company							6,131
Other Assets:
Money Market and Mutual Funds –Retirement Plans			1,582
Total Assets		$	3,247			$	9,018

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]

		September 30,				December 31,
(in thousands)		2020				2019
Finished Goods		$	18,901			$	31,863
Work in Process			14,480				16,508
Raw Material, Fuel and Supplies			48,490				49,480
Total Inventories		$	81,871			$	97,851

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

September 30, 2020 (in thousands)		Gross Carrying Amount				Accumulated Amortization				Net Carrying Amount				Remaining Amortization Periods (months)
Amortizable Intangible Assets:
Customer Relationships		$	22,491			$	12,095			$	10,396			79-179
Other			26				3				23			216
Total		$	22,517			$	12,098			$	10,419

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								Nine Months Ended
		September 30,								September 30,
(in thousands)		2020				2019				2020				2019
Amortization Expense – Intangible Assets		$	284			$	296			$	871			$	888

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

(in thousands)		2020				2021				2022				2023				2024
Estimated Amortization Expense – Intangible Assets		$	275			$	1,100			$	1,100			$	1,100			$	1,100

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

		As of September 30,
(in thousands)		2020				2019
Noncash Investing Activities:
Transactions Related to Capital Additions not Settled in Cash		$	112,314			$	15,893

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

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
(in thousands)		2020				2019				2020				2019
Beginning Balance		$	2,100			$	1,691			$	1,339			$	1,407
Additions Charged to Expense (net of recoveries)			474				86				1,845				549
Reductions for Amounts Written Off			(313	)			(225	)			(923	)			(404	)
Ending Balance		$	2,261			$	1,552			$	2,261			$	1,552

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