Note 6 - Leases (Details Textual) - USD ($) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
Dec. 31, 2019 |
|
| Lessee, Operating Lease, Remaining Lease Term (Year) | 8 years 4 months 24 days | 8 years 4 months 24 days | |||
| Operating Lease, Right-of-Use Asset | $ 10,300,000 | $ 10,300,000 | $ 12,300,000 | ||
| Operating Lease, Liability, Total | $ 11,104,000 | $ 11,104,000 | $ 12,400,000 | ||
| Operating Lease, Weighted Average Remaining Lease Term (Year) | 5 years | 5 years | |||
| Operating Lease, Weighted Average Discount Rate, Percent | 3.20% | 3.20% | |||
| Operating Lease, Payments | $ 855,000 | $ 888,000 | $ 2,600,000 | $ 2,500,000 | |
| X | ||||||||||
- Definition Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Present value of lessee's discounted obligation for lease payments from operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's right to use underlying asset under operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Weighted average discount rate for operating lease calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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