Note 10 - Regulatory Matters (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended		1 Months Ended	12 Months Ended	0 Months Ended
	Oct. 29, 2014 Series A Preferred Stock [Member] Subsequent Event [Member]	Oct. 29, 2014 Series A Preferred Stock [Member] Subsequent Event [Member]	May 31, 2014 Series A Preferred Stock [Member]	Dec. 31, 2009 Series A Preferred Stock [Member]	May 15, 2014 Preferred Stock [Member]	Sep. 30, 2014 Safest Assets [Member]	Sep. 30, 2014 Riskier Assets [Member]	Sep. 30, 2014 Compliance [Member] United Bank [Member]	Sep. 30, 2014 Compliance [Member] Citizens Northern [Member]	Sep. 30, 2014 United Bank [Member]		Dec. 31, 2013 United Bank [Member]		Sep. 30, 2014 Citizens Northern [Member]		Dec. 31, 2013 Citizens Northern [Member]
Note 10 - Regulatory Matters (Details) [Line Items]
Risk Weighting of Assets						0.00%	100.00%
Stock Redeemed or Called During Period, Shares (in Shares)			10,000		10,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in Shares)		10,000
Preferred Stock, Liquidation Preference Per Share (in Dollars per share)		$ 1,000
Preferred Stock, Redemption Amount (in Dollars)		$ 10.0
Preferred Stock, Dividend Rate, Percentage	9.00%
Stock Issued During Period, Shares, New Issues (in Shares)				30,000
Tier One Leverage Capital to Average Assets								9.00%	9.00%	10.74%	[1]	9.67%	[1]	9.70%	[1]	9.67%	[1]
Capital to Risk Weighted Assets								13.00%		18.62%	[2]	16.33%	[2]	15.60%	[2]	14.82%	[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%).