Note 11 - Regulatory Matters (Detail) - Regulatory Ratios Of The Consolidated Company And Its Subsidiary Banks	Mar. 31, 2013		Dec. 31, 2012		Dec. 31, 2010
Consolidated [Member]
Tier 1 Risk-based Capital	18.14%	[1]	18.27%	[1]
Total Risk-based Capital	19.40%	[1]	19.53%	[1]
Tier 1 Leverage	11.57%	[2]	11.24%	[2]
Farmers Bank [Member]
Tier 1 Risk-based Capital	18.33%	[1]	17.94%	[1]
Total Risk-based Capital	19.59%	[1]	19.20%	[1]
Tier 1 Leverage	10.26%	[2]	9.68%	[2]
United Bank [Member]
Tier 1 Risk-based Capital	15.23%	[1]	15.41%	[1]
Total Risk-based Capital	16.51%	[1]	16.69%	[1]
Tier 1 Leverage	9.79%	[2]	9.45%	[2]
First Citizens Bank [Member]
Tier 1 Risk-based Capital	14.16%	[1]	13.57%	[1]
Total Risk-based Capital	14.95%	[1]	14.46%	[1]
Tier 1 Leverage	10.02%	[2]	9.42%	[2]
Citizens Northern [Member]
Tier 1 Risk-based Capital	12.90%	[1]	12.97%	[1]
Total Risk-based Capital	14.14%	[1]	14.22%	[1]
Tier 1 Leverage	9.67%	[2]	9.36%	[2]	8.04%

[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.