Note 12 - Derivatives (Details Textual) $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($)
Derivative, Fixed Interest Rate Excluding Credit Spread	3.19%
Cash Flow Hedging [Member] \| Natural Gas Contracts [Member]
Maximum Length of Time Hedged in Cash Flow Hedge	1 year 180 days
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ (0.8)
Cash Flow Hedging [Member] \| Interest Rate Swaps [Member] \| Interest Expense [Member]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ (2.9)
Minimum [Member] \| Cash Flow Hedging [Member] \| Natural Gas Contracts [Member]
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage	40.00%
Maximum [Member] \| Cash Flow Hedging [Member] \| Natural Gas Contracts [Member]
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage	70.00%

Represents fixed interest rate excluding credit spreed for derivative.

No definition available.

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994

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- Definition

The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need.

+ References

No definition available.

+ Details

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- Definition

Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994

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