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Note 7 - Fair Values of Financial Instruments - Fair Value by Balance Sheet Grouping (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Available-for-sale securities, at fair value $ 27,930,267 $ 24,399,881
Reported Value Measurement [Member]    
Cash and due from banks 6,195,000 4,988,000
Interest-bearing deposits with banks 9,205,000 4,885,000
Available-for-sale securities, at fair value 27,930,000 24,400,000
Loans held for sale 20,219,000 15,424,000
Loans held for investment, net 280,230,000 257,896,000
Derivative IRLC's, fair value disclosure 336,000  
Derivative forward commitments 44,000  
Stock in financial institutions 3,884,000 3,826,000
Demand deposits, savings and NOW deposits 177,646,000 172,512,000
Time deposits 73,868,000 63,049,000
Federal Home Loan Bank advances 70,000,000 45,000,000
Estimate of Fair Value Measurement [Member]    
Cash and due from banks 6,195,000 4,988,000
Interest-bearing deposits with banks 9,205,000 4,885,000
Available-for-sale securities, at fair value 27,930,000 24,400,000
Loans held for sale 20,219,000 15,424,000
Loans held for investment, net 280,940,000 257,937,000
Derivative IRLC's, fair value disclosure 336,000  
Derivative forward commitments 44,000  
Stock in financial institutions 3,884,000 3,826,000
Demand deposits, savings and NOW deposits 162,325,000 168,080,000
Time deposits 73,830,000 63,076,000
Federal Home Loan Bank advances 69,462,000 45,176,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and due from banks 6,195,000 4,988,000
Interest-bearing deposits with banks 9,205,000 4,885,000
Available-for-sale securities, at fair value 0 0
Loans held for sale 0 0
Loans held for investment, net 0 0
Derivative IRLC's, fair value disclosure 0  
Derivative forward commitments 0  
Stock in financial institutions 0 0
Demand deposits, savings and NOW deposits 162,325,000 168,080,000
Time deposits 0 0
Federal Home Loan Bank advances 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and due from banks 0 0
Interest-bearing deposits with banks 0 0
Available-for-sale securities, at fair value 27,930,000 24,400,000
Loans held for sale 20,219,000 15,424,000
Loans held for investment, net 0 0
Derivative IRLC's, fair value disclosure 0  
Derivative forward commitments 44,000  
Stock in financial institutions 3,884,000 3,826,000
Demand deposits, savings and NOW deposits 0 0
Time deposits 73,830,000 63,076,000
Federal Home Loan Bank advances 69,462,000 45,176,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and due from banks 0 0
Interest-bearing deposits with banks 0 0
Available-for-sale securities, at fair value 0 0
Loans held for sale 0 0
Loans held for investment, net 280,940,000 257,937,000
Derivative IRLC's, fair value disclosure 336,000  
Derivative forward commitments 0  
Stock in financial institutions 0 0
Demand deposits, savings and NOW deposits 0 0
Time deposits 0 0
Federal Home Loan Bank advances $ 0 $ 0