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Note 3 - Loans Held for Investment, Net (Details Textual)
9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
USD ($)
Loans Receivable, Gross, Commercial, Construction $ 18,500,000       $ 16,400,000
Financing Receivable, Recorded Investment, Nonaccrual Status $ 5,344,477       5,436,972
Nonaccrual Loan Secure Percentage 82.80%        
Impaired Financing Receivable, Interest Income, Accrual Method, Total $ 4,000 $ 2,700      
Financing Receivable, Modifications, Recorded Investment 0       0
Veterans Administration Loan [Member]          
Number of Receivable Commitments Outstanding     0 0  
Real Estate [Member]          
Financing Receivable, Recorded Investment, Nonaccrual Status 4,400,000        
Small Business Administration [Member]          
Financing Receivable, Recorded Investment, Nonaccrual Status $ 3,400,000        
Nonaccrual Loan Secure Percentage 64.00%        
Commercial Real Estate Portfolio Segment [Member]          
Loans Receivable, Gross, Commercial, Construction $ 15,000,000       13,400,000
Financing Receivable, Recorded Investment, Nonaccrual Status 3,571,208       3,483,078
One-to-four Family Residential Real Estate Portfolio Segment [Member]          
Loans Receivable, Gross, Commercial, Construction 1,900,000       1,300,000
Financing Receivable, Recorded Investment, Nonaccrual Status 663,580       679,184
Consumer Portfolio Segment [Member]          
Loans and Leases Receivable, Gross, Consumer, Construction $ 1,600,000       $ 1,700,000