Annual report pursuant to Section 13 and 15(d)

Note 11 - Employees' Benefit Plans (Details Textual)

v3.21.1
Note 11 - Employees' Benefit Plans (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 6.50% 7.00%
Defined Contribution Plan, Cost $ 948,000 $ 884,000
Deferred Compensation Liability, Current and Noncurrent, Total 235,000 226,000
Deferred Compensation Arrangement with Individual, Compensation Expense 8,000 10,000
Deferred Costs, Total 68,000 60,000
Deferred Fee Liability $ 1,400 $ 1,300
Two Years Of Service [Member] | Trust for Benefit of Employees [Member]    
Defined Benefit Plan, Funded Percentage 40.00%  
Three Years Of Service [Member] | Trust for Benefit of Employees [Member]    
Defined Benefit Plan, Funded Percentage 60.00%  
Four Years Of Service [Member] | Trust for Benefit of Employees [Member]    
Defined Benefit Plan, Funded Percentage 80.00%  
Five Years Of Service [Member] | Trust for Benefit of Employees [Member]    
Defined Benefit Plan, Funded Percentage 100.00%  
Minimum [Member]    
Defined Benefit Plan Employees Pre-tax Contributions 1.00%  
Maximum [Member]    
Defined Benefit Plan Employees Pre-tax Contributions 50.00%