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Annual report pursuant to Section 13 and 15(d)

Note 5 - Employee Benefit Plans (Details Textual)

v3.6.0.2
Note 5 - Employee Benefit Plans (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Contribution Plan, Employer Discretionary Contribution Amount Ìý $ 51,438 $ 46,519 $ 41,172
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax Ìý 91,422 95,899 33,632
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax Ìý 49,227 51,638 18,109
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax Ìý $ 91,422 $ 95,899 $ 33,632
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on 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 Return on 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 Return on Assets Ìý 2.50% Ìý Ìý
Minimum [Member] | Fixed Income Securities [Member] Ìý Ìý Ìý Ìý
Defined Benefit Plan, Target Plan Asset Allocations Ìý 30.00% Ìý Ìý
Minimum [Member] | Equity Securities [Member] Ìý Ìý Ìý Ìý
Defined Benefit Plan, Target Plan Asset Allocations Ìý 20.00% Ìý Ìý
Maximum [Member] Ìý Ìý Ìý Ìý
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Ìý 8.50% Ìý Ìý
Maximum [Member] | Fixed Income Securities [Member] Ìý Ìý Ìý Ìý
Defined Benefit Plan, Target Plan Asset Allocations Ìý 80.00% Ìý Ìý
Maximum [Member] | Equity Securities [Member] Ìý Ìý Ìý Ìý
Defined Benefit Plan, Target Plan Asset Allocations Ìý 60.00% Ìý Ìý
Scenario, Forecast [Member] Ìý Ìý Ìý Ìý
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax $ 107,510 Ìý Ìý Ìý
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax $ 0 Ìý Ìý Ìý