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Note 7 - Fair Values of Financial Instruments - Fair Value by Balance Sheet Grouping (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Financial assets:    
Available-for-sale securities, at fair value $ 29,233,376 $ 24,399,881
Reported Value Measurement [Member]    
Financial assets:    
Cash and due from banks 6,861,000 4,988,000
Interest-bearing deposits with banks 14,360,000 4,885,000
Available-for-sale securities, at fair value 29,233,000 24,400,000
Loans held for sale 21,308,000 15,424,000
Loans held for investment, net 276,559,000 257,896,000
Derivative IRLC's, fair value disclosure 480,000  
Derivative forward commitments (58,000)  
Stock in financial institutions 3,861,000 3,826,000
Financial liabilities:    
Demand deposits, savings and NOW deposits 174,623,000 172,512,000
Time deposits 71,885,000 63,049,000
Federal Home Loan Bank advances 80,000,000 45,000,000
Estimate of Fair Value Measurement [Member]    
Financial assets:    
Cash and due from banks 6,861,000 4,988,000
Interest-bearing deposits with banks 14,360,000 4,885,000
Available-for-sale securities, at fair value 29,233,000 24,400,000
Loans held for sale 21,308,000 15,424,000
Loans held for investment, net 276,910,000 257,937,000
Derivative IRLC's, fair value disclosure 480,000  
Derivative forward commitments (58,000)  
Stock in financial institutions 3,861,000 3,826,000
Financial liabilities:    
Demand deposits, savings and NOW deposits 160,272,000 168,080,000
Time deposits 71,739,000 63,076,000
Federal Home Loan Bank advances 79,944,000 45,176,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial assets:    
Cash and due from banks 6,861,000 4,988,000
Interest-bearing deposits with banks 14,360,000 4,885,000
Available-for-sale securities, at fair value 0 0
Loans held for sale 0 0
Loans held for investment, net 0
Derivative IRLC's, fair value disclosure  
Derivative forward commitments 0  
Stock in financial institutions 0 0
Financial liabilities:    
Demand deposits, savings and NOW deposits 160,272,000 168,080,000
Time deposits 0
Federal Home Loan Bank advances 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Financial assets:    
Cash and due from banks 0 0
Interest-bearing deposits with banks 0 0
Available-for-sale securities, at fair value 29,233,000 24,400,000
Loans held for sale 21,308,000 15,424,000
Loans held for investment, net 0
Derivative IRLC's, fair value disclosure  
Derivative forward commitments (58,000)  
Stock in financial institutions 3,861,000 3,826,000
Financial liabilities:    
Demand deposits, savings and NOW deposits 0
Time deposits 71,739,000 63,076,000
Federal Home Loan Bank advances 79,944,000 45,176,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Financial assets:    
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 276,910,000 257,937,000
Derivative IRLC's, fair value disclosure 480,000  
Derivative forward commitments 0  
Stock in financial institutions 0 0
Financial liabilities:    
Demand deposits, savings and NOW deposits 0
Time deposits 0
Federal Home Loan Bank advances $ 0