Note 12 - Commitments and Contingencies (Details Textual)	6 Months Ended
	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Corning, California [Member]
Capital Leased Assets, Number of Units	1
Standby Letters of Credit [Member]
Expiry of Standby Letters of Credit Within One Year	$ 133,000
Expiry of Standby Letter of Credit Thereafter	2,000,000
Other Liabilities [Member]
Reserve for Unfunded Commitments Included in Other Liabilities	$ 695,000	$ 695,000
Number of Operating Leases Sites	7
Additional Provisions to Reserve for Unfunded Commitments	$ 0
Reserve for Unfunded Commitments Included in Other Liabilities	$ 695,000
Real Estate Related Loans Representing Lease Portfolio	73.00%	74.00%