Note 4 - Fair Value Measurements - Fair Value, Assets and Liabilities Measured on Recurring basis (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total	$ 0	$ 0
Mortgage loan commitments	0	0
Total	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total	80,116,000	111,974,000
Mortgage loan commitments	167,000	36,000
Total	80,283,000	112,010,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total	0	0
Mortgage loan commitments	0	0
Total	0	0
Fair Value, Measurements, Recurring [Member]
Total	80,116,000	111,974,000
Mortgage loan commitments	167,000	36,000
Total	80,283,000	112,010,000
Total	$ 80,116,000	$ 111,974,000