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Note 6 - Leases (Details Textual) - USD ($)	9 Months Ended
	Sep. 30, 2019	Jan. 01, 2019
Operating Lease, Weighted Average Remaining Lease Term	39 months	29 months
Operating Lease, Weighted Average Discount Rate, Percent	2.50%	2.10%
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 529,000
Operating Lease, Payments	459,000
Other Operating Income (Expense) [Member]
Operating Lease, Cost	1,300,000
Short-term Lease, Cost	$ 846,000
Minimum [Member]
Lessee, Operating Lease, Renewal Term	6 months
Maximum [Member]
Lessee, Operating Lease, Renewal Term	3 years

X

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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X

- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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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

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-Publisher FASB
-Name Accounting Standards Codification
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X

- Definition

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

+ References

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-Publisher FASB
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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

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- Definition

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

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X

- Definition

Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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