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Note 11 - Retirement Plans - Allocation of Plan Assets (Details)
Dec. 31, 2019
Dec. 31, 2018
Plan assets, percent 100.00% 100.00%
Insurance General Account [Member]    
Plan assets, percent 17.00% 19.00%
Cash and Cash Equivalents [Member]    
Plan assets, percent 2.00% 1.00%
Equity Securities [Member]    
Plan assets, percent 47.00% 47.00%
Fixed Income Securities [Member]    
Plan assets, percent 32.00% 31.00%
Real Estate [Member]    
Plan assets, percent 2.00% 2.00%