Note 9 - Hedging Activities (Details Textual) - USD ($)	1 Months Ended
	Jan. 31, 2016	Feb. 29, 2012	Sep. 30, 2016	Jan. 26, 2016	Jan. 25, 2016	Dec. 31, 2015
Junior Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]
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
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust		$ 32,000,000	$ 44,665,000			$ 55,154,000
Fair Value of Interest Rate Swap Agreement Liability			$ 200,000			$ 300,000