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Note 9 - Hedging Activities (Details) - USD ($)
1 Months Ended
Jan. 31, 2016
Feb. 29, 2012
Mar. 31, 2016
Jan. 26, 2016
Jan. 25, 2016
Dec. 31, 2015
Note 9 - Hedging Activities (Details) [Line Items]            
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust   $ 32,000,000 $ 44,324,000     $ 55,154,000
Fair Value of Interest Rate Swap Agreement Liability     $ 300,000     $ 300,000
London Interbank Offered Rate (LIBOR) [Member] | Junior Subordinated Debt [Member]            
Note 9 - Hedging Activities (Details) [Line Items]            
Debt Instrument, Basis Spread on Variable Rate   2.18%        
Derivative, Notional Amount   $ 32,000,000   $ 21,000,000 $ 32,000,000  
Debt Instrument, Repurchased Face Amount       $ 11,000,000    
Interest Expense, Debt $ 200,000          
Debt Instrument, Repurchase Amount $ 11,000,000