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Note 14 - Income Taxes - Components of Income Tax Expense (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Federal:    
Current $ 4,102,000 $ 2,824,000
Deferred (886,000) 8,000
Total federal income tax expense 3,216,000 2,832,000
State:    
Current 1,366,000 1,056,000
Deferred (201,000) (40,000)
Total state income tax expense 1,165,000 1,016,000
Total income tax expense $ 4,381,000 $ 3,847,600