Note 11 - Regulatory Matters (Details) (USD $)	3 Months Ended
	Dec. 31, 2009	Sep. 30, 2009	Mar. 31, 2012 Compliance [Member] United Bank [Member]	Sep. 30, 2013 Compliance [Member] Citizens Northern [Member]	Sep. 30, 2013 United Bank [Member]		Dec. 31, 2012 United Bank [Member]		Sep. 30, 2013 Citizens Northern [Member]		Dec. 31, 2012 Citizens Northern [Member]		Sep. 30, 2013 Safest Assets [Member]	Sep. 30, 2013 Riskier Assets [Member]
Note 11 - Regulatory Matters (Details) [Line Items]
Risk Weighting of Assets													0.00%	100.00%
Common Stock, Dividends, Per Share, Declared (in Dollars per share)	$ 0.10	$ 0.25
Tier One Leverage Capital to Average Assets			9.00%	9.00%	9.70%	[1]	9.45%	[1]	9.54%	[1]	9.36%	[1]
Capital to Risk Weighted Assets			13.00%		16.35%	[2]	16.69%	[2]	14.50%	[2]	14.22%	[2]

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

[2] 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%).