Annual report pursuant to Section 13 and 15(d)

Note 5 - Employee Benefit Plans (Details Textual)

v3.3.1.900
Note 5 - Employee Benefit Plans (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Scenario, Forecast [Member]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax $ 140,649      
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax $ 0      
Minimum [Member] | Fixed Income Securities [Member]        
Defined Benefit Plan, Target Plan Asset Allocations   30.00%    
Minimum [Member] | Equity Securities [Member]        
Defined Benefit Plan, Target Plan Asset Allocations   20.00%    
Minimum [Member]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets   2.50%    
Maximum [Member] | Fixed Income Securities [Member]        
Defined Benefit Plan, Target Plan Asset Allocations   80.00%    
Maximum [Member] | Equity Securities [Member]        
Defined Benefit Plan, Target Plan Asset Allocations   60.00%    
Maximum [Member]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets   8.50%    
Inflation Rate [Member]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets   2.50%    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets   7.00% 7.00% 7.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount   $ 46,519 $ 41,172 $ 49,327
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax   95,899 33,632 72,601
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax   51,638 18,109 39,093
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax   $ 95,899 $ 33,632 $ 72,601
Defined Benefit Plan Benefit Payment Term   10 years