Note 5 - Securities (Details Textual)	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Restricted Stock [Member]
Restricted Investments	$ 1,170,000	$ 1,129,000
US States and Political Subdivisions Debt Securities [Member]
Number of Temporarily Impaired Securities	2
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value	$ 1,440,000
Continuous Unrealized Loss Position Aggregate Losses	24,000
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value	1,440,000	10,161,000
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses	$ 24,000	306,000
Other Securities [Member]
Number of Temporarily Impaired Securities	1
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value	$ 152,000
Continuous Unrealized Loss Position Aggregate Losses	37,000
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value	152,000	127,000
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses	$ 37,000	62,000
Number of Temporarily Impaired Securities	95
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value	$ 93,095,000
Continuous Unrealized Loss Position Aggregate Losses	$ 315,000
Number of Temporarily Impaired Securities Greater than Twelve Months	3
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value	$ 1,592,000	95,447,000
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses	$ 61,000	$ 3,698,000