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Note 10 - Stock-based Compensation and Incentive Plans - Share based Compensation Restricted Stock and Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Time Based Shares [Member]
Balance (in dollars per share)	$ 23.32	$ 24.21	$ 24.41
Granted (in dollars per share)	5.95	23.44	24.58
Vested (in dollars per share)	24.05	24.45	24.84
Cancelled/forfeited (in dollars per share)		24.70	27.15
Balance (in dollars per share)	$ 8.95	$ 23.32	$ 24.21
Balance (in shares)	403,768	1,081,084	1,157,646
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	594,234	186,143	455,063
Vested (in shares)	(265,919)	(784,868)	(503,677)
Cancelled/forfeited (in shares)		(78,591)	(27,948)
Balance (in shares)	732,083	403,768	1,081,084
Vested (in shares)	265,919	784,868	503,677
Cancelled/forfeited (in shares)		78,591	27,948
Performance Based Shares [Member]
Balance (in dollars per share)	$ 25.54	$ 26.04	$ 0
Granted (in dollars per share)	0	24.50	26.04
Vested (in dollars per share)	26.04	0	0
Cancelled/forfeited (in dollars per share)		24.50	0
Balance (in dollars per share)	$ 24.50	$ 25.54	$ 26.04
Balance (in shares)	93,814	63,365	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	0	101,143	63,365
Vested (in shares)	(63,365)	0	0
Cancelled/forfeited (in shares)		(70,694)	0
Balance (in shares)	30,449	93,814	63,365
Vested (in shares)	63,365	(0)	0
Cancelled/forfeited (in shares)		70,694	0

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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-Topic 718
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-Section 50
-Paragraph 2
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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Topic 718
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-Paragraph 2
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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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X

- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

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-Publisher FASB
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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