Note 9 - Loans (Detail) (USD $)	6 Months Ended	12 Months Ended
	Sep. 30, 2012	Mar. 31, 2012
Loans and Leases Receivable, Collateral for Secured Borrowings	$ 1,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status	5,600,000	7,200,000
Impaired Financing Receivable, Average Recorded Investment	7,934,000	8,546,000
Impaired Financing Receivable, Interest Income, Accrual Method	89,589	152,910
Financing Receivable, Allowance for Credit Losses, Write-downs	330,000
Loans Receivable, Fair Value Disclosure	97,077,000	103,700,000
	7.11%	7.06%
Removed from Non-Accrual [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Current	442,000
Residential Mortgages [Member]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	825,000
Commercial Real Estate Loans[Member]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	116,000
Payments for (Proceeds from) Loans Receivable	423,000
Financing Receivable, Allowance for Credit Losses, Write-downs	47,000
Commercial Loans [Member]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	46,000
Financing Receivable, Allowance for Credit Losses, Write-downs	13,000
Consumer [Member]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	39,000
Commercial Mortgages [Member]
Transfer to Other Real Estate	606,000
Full Charge Off [Member]
Financing Receivable, Allowance for Credit Losses, Write-downs		447,000
Amount of Additional Capital to One Borrower Secured by Marketable Securities [Member] | Partial Charge Off [Member]
Financing Receivable, Allowance for Credit Losses, Write-downs		1,300,000
Percentage of Capital to One Borrower [Member]
Description of Regulatory Requirements, Capital Adequacy Purposes	15%
Amount of Capital to One Borrower [Member]
Description of Regulatory Requirements, Capital Adequacy Purposes	$1.9
Increase for Period [Member]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	1,700
Downgraded Loans [Member]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	988,000
Change During Period, Fair Value Disclosure [Member]
Loans Receivable, Fair Value Disclosure	$ 29,000