Note 3 - Cash and Cash Equivalents (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Note 3 - Cash and Cash Equivalents (Details) [Line Items]
Average Reserve Balances Required to Be Maintained With Federal Bank	$ 0	$ 138,000
Average Excess Balances Maintained With Federal Reserve Bank	163,300,000	$ 170,100,000
Interest Rate Swap [Member]
Note 3 - Cash and Cash Equivalents (Details) [Line Items]
Margin Deposit Assets	$ 7,900,000