Note 11 - Regulatory Matters (Details) - Regulatory Ratios of the Consolidated Company and its Subsidiary Banks	Jun. 30, 2013		Dec. 31, 2012
Consolidated [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Risk-based Capital	18.26%	[1]	18.27%	[1]
Total Risk-based Capital	19.52%	[1]	19.53%	[1]
Tier 1 Leverage	11.53%	[2]	11.24%	[2]
Farmers Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Risk-based Capital	17.53%	[1]	17.94%	[1]
Total Risk-based Capital	18.79%	[1]	19.20%	[1]
Tier 1 Leverage	9.85%	[2]	9.68%	[2]
United Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Risk-based Capital	14.90%	[1]	15.41%	[1]
Total Risk-based Capital	16.17%	[1]	16.69%	[1]
Tier 1 Leverage	9.47%	[2]	9.45%	[2]
First Citizens Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Risk-based Capital	13.26%	[1]	13.57%	[1]
Total Risk-based Capital	14.04%	[1]	14.46%	[1]
Tier 1 Leverage	9.01%	[2]	9.42%	[2]
Citizens Northern [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Risk-based Capital	13.08%	[1]	12.97%	[1]
Total Risk-based Capital	14.33%	[1]	14.22%	[1]
Tier 1 Leverage	9.67%	[2]	9.36%	[2]

[1] Tier 1 Risk-based and Total Risk-based Capital ratios are computed by dividing a bank's 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.