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Annual report pursuant to Section 13 and 15(d)

Note 5 - Employee Benefit Plans (Details Textual)

v3.8.0.1
Note 5 - Employee Benefit Plans (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Contribution Plan, Employer Discretionary Contribution Amount Ìý $ 100,000 $ 100,000 $ 100,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax Ìý 100,000 100,000 100,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Ìý 100,000 100,000 100,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax Ìý $ 70,000 $ 91,000 $ 96,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Ìý 7.00% 7.00% 7.00%
Defined Benefit Plan Benefit Payment Term Ìý 10 years Ìý Ìý
Inflation Rate [Member] Ìý Ìý Ìý Ìý
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Ìý 2.50% Ìý Ìý
Minimum [Member] Ìý Ìý Ìý Ìý
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Ìý 2.50% Ìý Ìý
Minimum [Member] | Fixed Income Securities [Member] Ìý Ìý Ìý Ìý
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Ìý 30.00% Ìý Ìý
Minimum [Member] | Equity Securities [Member] Ìý Ìý Ìý Ìý
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Ìý 20.00% Ìý Ìý
Maximum [Member] Ìý Ìý Ìý Ìý
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Ìý 8.50% Ìý Ìý
Maximum [Member] | Fixed Income Securities [Member] Ìý Ìý Ìý Ìý
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Ìý 80.00% Ìý Ìý
Maximum [Member] | Equity Securities [Member] Ìý Ìý Ìý Ìý
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Ìý 60.00% Ìý Ìý
Scenario, Forecast [Member] Ìý Ìý Ìý Ìý
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax $ 100,000 Ìý Ìý Ìý
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax $ 0 Ìý Ìý Ìý