Note 7 - Securities Available for Sale - Summary of Securities Available for Sale (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Total	$ 509,000	$ 728,000
Gross unrealized gains	19,000	31,000
Gross unrealized losses	0	0
Total	528,000	759,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Total		725,000
Gross unrealized gains	11,000	22,000
Gross unrealized losses	0	0
Total	502,000	747,000
Collateralized Mortgage Backed Securities [Member] | Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Total	491,000
Collateralized Mortgage Backed Securities [Member]
Total	1,606,000	2,237,000
Gross unrealized gains	44,000	55,000
Gross unrealized losses	(9,000)	(9,000)
Total	1,641,000	2,283,000
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Total	578,000	742,000
Gross unrealized gains	14,000	2,000
Gross unrealized losses	(4,000)	(1,000)
Total	588,000	743,000
Collateralized Mortgage Obligations [Member] | Other Long-term Investments [Member]
Total	28,000	42,000
Gross unrealized gains	0	0
Gross unrealized losses	(5,000)	(8,000)
Total	23,000	34,000
Other Marketable Securities [Member] | US Government Agencies Debt Securities [Member]
Total	69,980,000	105,003,000
Gross unrealized gains	191,000	68,000
Gross unrealized losses	0	(129,000)
Total	70,171,000	104,942,000
Other Marketable Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
Total	2,957,000	3,991,000
Gross unrealized gains	44,000	18,000
Gross unrealized losses	(2,000)	(7,000)
Total	2,999,000	4,002,000
Other Marketable Securities [Member] | Corporate Debt Securities [Member]
Total	316,000	340,000
Gross unrealized gains	18,000	0
Gross unrealized losses	0	(6,000)
Total	334,000	334,000
Other Marketable Securities [Member] | Preferred Stock [Member]
Total	700,000	700,000
Gross unrealized gains	0	0
Gross unrealized losses	(350,000)	(350,000)
Total	350,000	350,000
Other Marketable Securities [Member] | Equity Securities [Member]
Total	58,000	58,000
Gross unrealized gains	12,000	5,000
Gross unrealized losses	0	0
Total	70,000	63,000
Other Marketable Securities [Member]
Total	74,011,000	110,092,000
Gross unrealized gains	265,000	91,000
Gross unrealized losses	(352,000)	(492,000)
Total	73,924,000	109,691,000
Total	75,617,000	112,329,000
Gross unrealized gains	309,000	146,000
Gross unrealized losses	(361,000)	(501,000)
Total	$ 75,565,000	$ 111,974,000