Note 8 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (USD $)	Jun. 30, 2013	Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Note 8 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis [Line Items]
Impaired loans	$ 0	$ 0
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Note 8 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis [Line Items]
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Note 8 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis [Line Items]
Impaired loans	5,797	6,346
Fair Value, Measurements, Nonrecurring [Member] | Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member]
Note 8 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis [Line Items]
Real estate owned	0	0
Fair Value, Measurements, Nonrecurring [Member] | Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member]
Note 8 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis [Line Items]
Real estate owned	0	0
Fair Value, Measurements, Nonrecurring [Member] | Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Note 8 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis [Line Items]
Real estate owned	2,156	2,470
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Note 8 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis [Line Items]
Total	0	0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Note 8 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis [Line Items]
Total	0	0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Note 8 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis [Line Items]
Total	7,953	8,816
Fair Value, Inputs, Level 1 [Member]
Note 8 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis [Line Items]
Impaired loans		0
Fair Value, Inputs, Level 3 [Member]
Note 8 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis [Line Items]
Impaired loans	87,469,000	91,300,000
Real estate owned	$ 2,156,000	$ 2,470,000