Note 8 - Fair Value Measurements (Details) - Investment Securities Available-for-Sale Measured at Fair Value on a Recurring Basis (USD $)	Dec. 31, 2013	Mar. 31, 2013
Investment securities available-for-sale:
Available for sale securities fair value	$ 51,666,297	$ 56,282,175
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Investment securities available-for-sale:
Available for sale securities fair value	0	1,024,845
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Investment securities available-for-sale:
Available for sale securities fair value	14,495,504	14,096,933
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Investment securities available-for-sale:
Available for sale securities fair value	0	0
US Government Agencies Debt Securities [Member]
Investment securities available-for-sale:
Available for sale securities fair value	14,495,504	15,121,778
Brokered Certificates of Deposit [Member] \| Fair Value, Inputs, Level 1 [Member]
Investment securities available-for-sale:
Available for sale securities fair value	0	8,479,275
Brokered Certificates of Deposit [Member] \| Fair Value, Inputs, Level 2 [Member]
Investment securities available-for-sale:
Available for sale securities fair value	5,157,824	0
Brokered Certificates of Deposit [Member] \| Fair Value, Inputs, Level 3 [Member]
Investment securities available-for-sale:
Available for sale securities fair value	0	0
Brokered Certificates of Deposit [Member]
Investment securities available-for-sale:
Available for sale securities fair value	5,157,824	8,479,275
Agency Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Investment securities available-for-sale:
Available for sale securities fair value	255,397	1,022,582
Agency Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Investment securities available-for-sale:
Available for sale securities fair value	20,769,423	17,503,140
Agency Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Investment securities available-for-sale:
Available for sale securities fair value	1,452	495,932
Agency Mortgage Backed Securities [Member]
Investment securities available-for-sale:
Available for sale securities fair value	21,026,272	19,021,654
Agency Collateralized Mortgage Obligations [Member] \| Fair Value, Inputs, Level 1 [Member]
Investment securities available-for-sale:
Available for sale securities fair value	0	285,887
Agency Collateralized Mortgage Obligations [Member] \| Fair Value, Inputs, Level 2 [Member]
Investment securities available-for-sale:
Available for sale securities fair value	10,986,697	12,797,159
Agency Collateralized Mortgage Obligations [Member] \| Fair Value, Inputs, Level 3 [Member]
Investment securities available-for-sale:
Available for sale securities fair value	0	576,422
Agency Collateralized Mortgage Obligations [Member]
Investment securities available-for-sale:
Available for sale securities fair value	10,986,697	13,659,468
Fair Value, Inputs, Level 1 [Member]
Investment securities available-for-sale:
Available for sale securities fair value	255,397	10,812,589
Fair Value, Inputs, Level 2 [Member]
Investment securities available-for-sale:
Available for sale securities fair value	51,409,450	44,397,232
Fair Value, Inputs, Level 3 [Member]
Investment securities available-for-sale:
Available for sale securities fair value	$ 1,452	$ 1,072,354

Madison Bancorp Inc 10-Q