Note 9 - Loans (Detail) - Impaired Loans by Portfolio Class (USD $)	6 Months Ended	12 Months Ended
	Sep. 30, 2012	Mar. 31, 2012
Impaired loans with no valuation allowance:
Recorded Investment	$ 7,089,000	$ 8,631,000
Related Valuation Allowance	0	0
Average Recorded Investment	7,934,000	8,546,000
Interest Income Recognized While On Impaired Status	89,589	152,910
Residential (One to Four Family) Real Estate [Member] | Impaired Financing Receivable With No Valuation Allowance [Member]
Impaired loans with no valuation allowance:
Recorded Investment		3,357,000
Unpaid Principal Balance		3,344,000
Related Valuation Allowance		0
Average Recorded Investment		3,443,000
Interest Income Recognized While On Impaired Status		66,000
Residential (One to Four Family) Real Estate [Member]
Impaired loans with no valuation allowance:
Recorded Investment	2,712,000
Unpaid Principal Balance	2,687,000
Average Recorded Investment	3,125,000
Interest Income Recognized While On Impaired Status	45,000
Multi-Family and Commercial Real Estate [Member] | Impaired Financing Receivable With No Valuation Allowance [Member]
Impaired loans with no valuation allowance:
Recorded Investment		5,287,000
Unpaid Principal Balance		5,287,000
Related Valuation Allowance		0
Average Recorded Investment		4,853,000
Interest Income Recognized While On Impaired Status		87,000
Multi-Family and Commercial Real Estate [Member]
Impaired loans with no valuation allowance:
Recorded Investment	4,038,000
Unpaid Principal Balance	4,038,000
Average Recorded Investment	4,569,000
Interest Income Recognized While On Impaired Status	38,000
Commercial Loans [Member] | Impaired Financing Receivable With No Valuation Allowance [Member]
Impaired loans with no valuation allowance:
Recorded Investment		0
Unpaid Principal Balance		0
Related Valuation Allowance		0
Average Recorded Investment		19,000
Interest Income Recognized While On Impaired Status		0
Commercial Loans [Member]
Impaired loans with no valuation allowance:
Recorded Investment	141,000
Unpaid Principal Balance	141,000
Average Recorded Investment	140,000
Interest Income Recognized While On Impaired Status	5,000
Home Equity Loans [Member] | Impaired Financing Receivable With No Valuation Allowance [Member]
Impaired loans with no valuation allowance:
Related Valuation Allowance		0
Average Recorded Investment		111,000
Home Equity Loans [Member]
Impaired loans with no valuation allowance:
Recorded Investment	78,000
Unpaid Principal Balance	78,000
Average Recorded Investment	41,000
Consumer [Member] | Impaired Financing Receivable With No Valuation Allowance [Member]
Impaired loans with no valuation allowance:
Related Valuation Allowance		0
Average Recorded Investment		120,000
Interest Income Recognized While On Impaired Status		0
Consumer [Member]
Impaired loans with no valuation allowance:
Recorded Investment	39,000
Unpaid Principal Balance	39,000
Average Recorded Investment	6,000
Construction [Member] | Impaired Financing Receivable With No Valuation Allowance [Member]
Impaired loans with no valuation allowance:
Recorded Investment		0
Unpaid Principal Balance		0
Related Valuation Allowance		0
Average Recorded Investment		0
Interest Income Recognized While On Impaired Status		0
Construction [Member]
Impaired loans with no valuation allowance:
Recorded Investment	53,000
Unpaid Principal Balance	53,000
Average Recorded Investment	53,000
Interest Income Recognized While On Impaired Status	2,000
Total [Member] | Impaired Financing Receivable With No Valuation Allowance [Member]
Impaired loans with no valuation allowance:
Recorded Investment		8,644,000
Unpaid Principal Balance		8,631,000
Related Valuation Allowance		0
Average Recorded Investment		8,546,000
Interest Income Recognized While On Impaired Status		153,000
Total [Member]
Impaired loans with no valuation allowance:
Recorded Investment	7,061,000
Unpaid Principal Balance	7,036,000
Average Recorded Investment	7,934,000
Interest Income Recognized While On Impaired Status	$ 90,000