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Note 8 - Benefit Plans (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Defined Benefit Plans Number of Plans | 2 |  |
Defined Benefit Plans Retirement Age | 65 years |  |
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total | $ (7,145) | $ (6,241) |
Other Assets [Member] | Nonqualified Plan [Member] |  |  |
Cash Surrender Value of Life Insurance | 2,900 | 2,200 |
Other Noncurrent Liabilities [Member] | Nonqualified Plan [Member] |  |  |
Deferred Compensation Liability, Classified, Noncurrent, Total | 2,900 | 2,200 |
Pension Plan [Member] |  |  |
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total | (1,700) |  |
Defined Benefit Plan, Expected Amortization, Next Fiscal Year, Total | (1,300) |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 100 |  |
Supplemental Employee Retirement Plan [Member] |  |  |
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total | (8,800) |  |
Postretirement Life Insurance [Member] |  |  |
Cash Surrender Value of Life Insurance | 2,700 | 2,200 |
Postretirement Life Insurance [Member] | Life Insurance Contracts [Member] |  |  |
Gain (Loss) on Investments, Total | $ 300 | 300 | $ 100
401(K) Plan [Member} |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 25.00% |  |
Defined Contribution Plan, Employer Discretionary Contribution, Percent | 3.00% |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 800 | $ 1,000 | $ 1,100

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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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