EMPLOYEE STOCK OWNERSHIP PLAN: Employee Stock Ownership Plan (ESOP) Disclosures (Details) - USD ($)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Employee Stock Ownership Plan Esop Deferred Shares Fair Value [Roll Forward]
Estimated fair value of unreleased shares, beginning	$ 176,000	$ 207,000	$ 332,500
Unreleased Employee stock ownership shares, beginning	24,633	49,266	73,899
Employee stock ownership plan allocated and released shares, beginning	937,951	913,318	888,685
Employee Stock Ownership Plan total, beginning	962,584	962,584	962,584
Employee stock ownership plan unreleased allocation of shares	(24,633)	(24,633)	(24,633)
Allocated and released contributed Employee stock ownership plan	24,633	24,633	24,633
Estimated fair value of unreleased shares, ending	$ 0	$ 176,000	$ 207,000
Unreleased Employee stock ownership shares, ending	0	24,633	49,266
Employee stock ownership plan allocated and released shares, ending	962,584	937,951	913,318
Employee Stock Ownership Plan total, ending	962,584	962,584	962,584