Note 5 - Securities (Details Textual)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Restricted Stock [Member]
Restricted Investments	$ 1,170,000	$ 1,129,000
US Government Agencies Debt Securities [Member]
Number of Temporarily Impaired Securities	5
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value	$ 3,659,000
Continuous Unrealized Loss Position Aggregate Losses	39,000
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value	3,659,000	84,959,000
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses	$ 39,000	3,329,000
US States and Political Subdivisions Debt Securities [Member]
Number of Temporarily Impaired Securities	3
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value	$ 2,210,000
Continuous Unrealized Loss Position Aggregate Losses	36,000
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value	2,210,000	10,161,000
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses	$ 36,000	306,000
Corporate Debt Securities [Member]
Number of Temporarily Impaired Securities	1
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value	$ 942,000
Continuous Unrealized Loss Position Aggregate Losses	35,000
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value	942,000	200,000
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses	$ 35,000	1,000
Other Securities [Member]
Number of Temporarily Impaired Securities	1
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value	$ 141,000
Continuous Unrealized Loss Position Aggregate Losses	48,000
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value	141,000	127,000
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses	$ 48,000	62,000
Number of Temporarily Impaired Securities	92
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value	$ 88,830,000
Continuous Unrealized Loss Position Aggregate Losses	$ 358,000
Number of Temporarily Impaired Securities Greater than Twelve Months	10
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value	$ 6,952,000	95,447,000
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses	$ 158,000	$ 3,698,000