Note 11 - Regulatory Matters (Details) - Regulatory Ratios of the Consolidated Company and Its Subsidiary Banks		Jun. 30, 2015	Dec. 31, 2014
Consolidated [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Risk-based Capital	[1]	14.54%
Tier 1 Risk-based Capital	[1]	18.71%	19.75%
Total Risk-based Capital	[1]	19.79%	21.00%
Tier 1 Leverage	[2]	11.91%	12.04%
Farmers Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Risk-based Capital	[1]	16.58%
Tier 1 Risk-based Capital	[1]	16.58%	17.71%
Total Risk-based Capital	[1]	17.53%	18.70%
Tier 1 Leverage	[2]	9.36%	9.40%
United Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Risk-based Capital	[1]	18.74%
Tier 1 Risk-based Capital	[1]	18.74%	18.00%
Total Risk-based Capital	[1]	19.99%	19.26%
Tier 1 Leverage	[2]	12.51%	11.08%
First Citizens Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Risk-based Capital	[1]	13.36%
Tier 1 Risk-based Capital	[1]	13.36%	13.66%
Total Risk-based Capital	[1]	13.98%	14.30%
Tier 1 Leverage	[2]	9.32%	9.44%
Citizens Northern [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Risk-based Capital	[1]	13.98%
Tier 1 Risk-based Capital	[1]	13.98%	14.46%
Total Risk-based Capital	[1]	15.23%	15.71%
Tier 1 Leverage	[2]	9.89%	10.11%

[1] Common Equity Tier 1 Risked-based, Tier 1 Risk-based, and Total Risk-based Capital ratios are computed by dividing a bank's Common Equity Tier 1, Tier 1 or Total Capital, as defined by regulation, by a risk-weighted sum of the bank's assets, with the risk weighting determined by general standards established by regulation. The safest assets (e.g., government obligations) are assigned a weighting of 0% with riskier assets receiving higher ratings (e.g., ordinary commercial loans are assigned a weighting of 100%).

[2] Tier 1 Leverage ratio is computed by dividing a bank's Tier 1 Capital, as defined by regulation, by its total quarterly average assets.