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Note 19 - Fair Value of Financial Instruments and Fair Value Measurements (Details) - Financial Instruments - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment Securities Held to Maturity   $ 29,796
Investment Securities Available for Sale $ 296,149,299 274,594,586
Investment Securities Held to Maturity   29,923
Federal Home Loan Bank Stock 2,730,500 2,830,800
Deposits 1,011,554,236 979,303,474
Subordinated Debentures 24,229,000 24,229,000
Other Borrowed Money 40,000,000 40,000,000
Fair Value, Measurements, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Short-Term Investments 60,872,000 65,811,000
Investment Securities Held to Maturity   30,000
Investment Securities Available for Sale 296,149,000 274,595,000
Federal Home Loan Bank Stock 2,731,000 2,831,000
Loans, Net 749,675,000 736,930,000
Bank-Owned Life Insurance 14,830,000 14,531,000
Deposits 1,011,554,000 979,303,000
Subordinated Debentures 24,229,000 24,229,000
Other Borrowed Money 40,000,000 40,000,000
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Short-Term Investments 60,872,000 65,811,000
Investment Securities Available for Sale 296,149,000 274,595,000
Investment Securities Held to Maturity   30,000
Federal Home Loan Bank Stock 2,731,000 2,831,000
Loans, Net 750,412,000 738,948,000
Bank-Owned Life Insurance 14,830,000 14,531,000
Deposits 1,013,111,000 980,874,000
Subordinated Debentures 24,229,000 24,229,000
Other Borrowed Money 40,421,000 41,962,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Short-Term Investments 60,872,000 65,811,000
Investment Securities Available for Sale 0 0
Investment Securities Held to Maturity   0
Federal Home Loan Bank Stock 2,731,000 2,831,000
Loans, Net 0 0
Bank-Owned Life Insurance 14,830,000 14,531,000
Deposits 611,822,000 551,057,000
Subordinated Debentures 0 0
Other Borrowed Money 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Short-Term Investments 0 0
Investment Securities Available for Sale 295,219,000 273,647,000
Investment Securities Held to Maturity   30,000
Federal Home Loan Bank Stock 0 0
Loans, Net 741,867,000 731,170,000
Bank-Owned Life Insurance 0 0
Deposits 401,289,000 429,817,000
Subordinated Debentures 24,229,000 24,229,000
Other Borrowed Money 40,421,000 41,962,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Short-Term Investments 0 0
Investment Securities Available for Sale 930,000 948,000
Investment Securities Held to Maturity   0
Federal Home Loan Bank Stock 0 0
Loans, Net 8,545,000 7,778,000
Bank-Owned Life Insurance 0 0
Deposits 0 0
Subordinated Debentures 0 0
Other Borrowed Money $ 0 $ 0