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Note 6 - Fair Values of Financial Instruments - Fair Value by Balance Sheet Grouping (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Financial assets:    
Available-for-sale securities $ 26,715,509 $ 31,499,132
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument [Member]    
Financial assets:    
Derivative Asset 235,000  
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Commercial Mortgage Backed Securities [Member]    
Financial assets:    
Derivative Asset, Fair Value, Gross Asset 21,000  
Reported Value Measurement [Member]    
Financial assets:    
Cash and due from banks 8,566,000 4,766,000
Interest-bearing deposits with banks 26,330,000 11,645,000
Available-for-sale securities 26,716,000 31,499,000
Loans held for sale 10,479,000 14,221,000
Loans held for investment, net 266,057,000 241,399,000
Stock in financial institutions 3,809,000 3,575,000
Financial liabilities:    
Demand deposits, savings and NOW deposits 169,509,000 160,961,000
Time deposits 70,629,000 63,561,000
Federal Home Loan Bank advances 67,000,000 50,000,000
Reported Value Measurement [Member] | Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument [Member]    
Financial assets:    
Derivative Asset 235,401  
Reported Value Measurement [Member] | Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Commercial Mortgage Backed Securities [Member]    
Financial assets:    
Derivative Asset, Fair Value, Gross Asset 21,016  
Estimate of Fair Value Measurement [Member]    
Financial assets:    
Cash and due from banks 8,566,000 4,766,000
Interest-bearing deposits with banks 26,330,000 11,645,000
Available-for-sale securities 26,716,000 31,499,000
Loans held for sale 10,479,000 14,221,000
Loans held for investment, net 266,301,000 241,440,000
Stock in financial institutions 3,809,000 3,575,000
Financial liabilities:    
Demand deposits, savings and NOW deposits 162,458,000 156,529,000
Time deposits 70,426,000 63,588,000
Federal Home Loan Bank advances 66,968,000 50,176,000
Estimate of Fair Value Measurement [Member] | Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument [Member]    
Financial assets:    
Derivative Asset 235,401  
Estimate of Fair Value Measurement [Member] | Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Commercial Mortgage Backed Securities [Member]    
Financial assets:    
Derivative Asset, Fair Value, Gross Asset 21,016  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial assets:    
Cash and due from banks 8,566,000 4,766,000
Interest-bearing deposits with banks 26,330,000 11,645,000
Available-for-sale securities 0 0
Loans held for sale 0 0
Loans held for investment, net 0 0
Stock in financial institutions 0 0
Financial liabilities:    
Demand deposits, savings and NOW deposits 162,458,000 156,529,000
Time deposits 0 0
Federal Home Loan Bank advances 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument [Member]    
Financial assets:    
Derivative Asset 0  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Commercial Mortgage Backed Securities [Member]    
Financial assets:    
Derivative Asset, Fair Value, Gross Asset 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 26,716,000 31,499,000
Loans held for sale 10,479,000 14,221,000
Loans held for investment, net 0 0
Stock in financial institutions 3,809,000 3,575,000
Financial liabilities:    
Demand deposits, savings and NOW deposits 0 0
Time deposits 70,426,000 63,588,000
Federal Home Loan Bank advances 66,968,000 50,176,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument [Member]    
Financial assets:    
Derivative Asset 0  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Commercial Mortgage Backed Securities [Member]    
Financial assets:    
Derivative Asset, Fair Value, Gross Asset 21,016  
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 0 0
Loans held for sale 0 0
Loans held for investment, net 266,301,000 241,440,000
Stock in financial institutions 0 0
Financial liabilities:    
Demand deposits, savings and NOW deposits 0 0
Time deposits 0 0
Federal Home Loan Bank advances 0 $ 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument [Member]    
Financial assets:    
Derivative Asset 235,401  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Commercial Mortgage Backed Securities [Member]    
Financial assets:    
Derivative Asset, Fair Value, Gross Asset $ 0