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Note 7 - Fair Values of Financial Instruments - Fair Value by Balance Sheet Grouping (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Available-for-sale securities, at fair value $ 26,095,660 $ 24,399,881
Reported Value Measurement [Member]    
Cash and due from banks 4,762,000 4,988,000
Interest-bearing deposits with banks 7,580,000 4,885,000
Available-for-sale securities, at fair value 26,096,000 24,400,000
Loans held for sale 15,261,000 15,424,000
Loans held for investment, net 258,357,000 257,896,000
Derivative IRLCs 475,735,000  
Derivative forward commitments (64,609,000)  
Stock in financial institutions 3,843,000 3,826,000
Demand deposits, savings and NOW deposits 174,580,000 172,512,000
Time deposits 67,229,000 63,049,000
Federal Home Loan Bank advances 45,000,000 45,000,000
Estimate of Fair Value Measurement [Member]    
Cash and due from banks 4,762,000 4,988,000
Interest-bearing deposits with banks 7,580,000 4,885,000
Available-for-sale securities, at fair value 26,096,000 24,400,000
Loans held for sale 15,261,000 15,424,000
Loans held for investment, net 258,197,000 257,937,000
Derivative IRLCs 475,735,000  
Derivative forward commitments (64,609,000)  
Stock in financial institutions 3,843,000 3,826,000
Demand deposits, savings and NOW deposits 165,716,000 168,080,000
Time deposits 66,995,000 63,076,000
Federal Home Loan Bank advances 45,133,000 45,176,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and due from banks 4,762,000 4,988,000
Interest-bearing deposits with banks 7,580,000 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 IRLCs 0  
Derivative forward commitments 0  
Stock in financial institutions 0 0
Demand deposits, savings and NOW deposits 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 26,096,000 24,400,000
Loans held for sale 15,261,000 15,424,000
Loans held for investment, net 0 0
Derivative IRLCs 475,735,000  
Derivative forward commitments (64,609,000)  
Stock in financial institutions 3,843,000 3,826,000
Demand deposits, savings and NOW deposits 165,716,000 0
Time deposits 66,995,000 63,076,000
Federal Home Loan Bank advances 45,133,000 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 258,197,000 257,937,000
Derivative IRLCs 0  
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