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Note 10 - Leases (Details Textual) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
	Feb. 15, 2019	Sep. 30, 2019	Sep. 30, 2019
Operating Lease, Weighted Average Remaining Lease Term		4 years 2 months 12 days	4 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent		3.50%	3.50%
Operating Lease, Payments		$ 12.1	$ 32.7
Operating Lease, Expense		11.8	31.8
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		$ 8.7	$ 48.2
Cory 1st Choice Home Delivery [Member]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 16.0

X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977

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X

- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977

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X

- Definition

Weighted average discount rate for operating lease calculated at point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(4)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

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X

- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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X

- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
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