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EMPLOYEE BENEFIT PLANS: Stock Options Outstanding, less estimated forfeitures (Details 2) - USD ($)
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stock options fully vested and expected to vest:    
Number 101,332 141,365
Weighted average exercise price $ 3.26 $ 3.77
Aggregate intrinsic value $ 410,000 $ 788,000
Weighted average contractual term of options (years) 2 years 2 months 12 days 2 years 9 months 11 days
Stock options fully vested and currently exercisable:    
Number 101,332 141,365
Weighted average exercise price $ 3.26 $ 3.77
Aggregate intrinsic value $ 410,000 $ 788,000
Weighted average contractual term of options (years) 2 years 2 months 12 days 2 years 9 months 11 days