Note 18 - Commitments and Contingencies - The Company's Exposure to Off-balance Sheet Risk (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Exposure to off-balance sheet risk	$ 166,743,000	$ 120,763,000
Standby Letters of Credit [Member]
Exposure to off-balance sheet risk	487,000	341,000
Commitments to Extend Credit [Member]
Exposure to off-balance sheet risk	112,070,000	69,625,000
Overdraft Protection [Member]
Exposure to off-balance sheet risk	$ 54,186,000	$ 50,797,000