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EMPLOYEE BENEFIT PLANS: Additional information regarding options outstanding, by exercise price range (Details 1) - Stock options
12 Months Ended
Mar. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted Avg Remaining Contractual Life (years) 2 years 9 months 11 days
Options Outstanding, Number | shares 141,365
Options Outstanding, Weighted Average Exercise Price $ 3.77
Options Exercisable, Number | shares 141,365
Options Exercisable, Weighted Average Exercise Price $ 3.77
$1.00 - $3.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Price, lower 1.00
Range of Exercise Price, upper $ 3.00
Weighted Avg Remaining Contractual Life (years) 4 years 11 months 9 days
Options Outstanding, Number | shares 59,865
Options Outstanding, Weighted Average Exercise Price $ 2.71
Options Exercisable, Number | shares 59,865
Options Exercisable, Weighted Average Exercise Price $ 2.71
$3.01 - $5.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Price, lower 3.01
Range of Exercise Price, upper $ 5.00
Weighted Avg Remaining Contractual Life (years) 1 year 5 months 23 days
Options Outstanding, Number | shares 59,000
Options Outstanding, Weighted Average Exercise Price $ 3.84
Options Exercisable, Number | shares 59,000
Options Exercisable, Weighted Average Exercise Price $ 3.84
$5.01 - $8.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Price, lower 5.01
Range of Exercise Price, upper $ 8.00
Weighted Avg Remaining Contractual Life (years) 5 months 19 days
Options Outstanding, Number | shares 20,000
Options Outstanding, Weighted Average Exercise Price $ 6.17
Options Exercisable, Number | shares 20,000
Options Exercisable, Weighted Average Exercise Price $ 6.17
$8.01 - $9.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Price, lower 8.01
Range of Exercise Price, upper $ 9.00
Weighted Avg Remaining Contractual Life (years) 2 months 19 days
Options Outstanding, Number | shares 2,500
Options Outstanding, Weighted Average Exercise Price $ 8.12
Options Exercisable, Number | shares 2,500
Options Exercisable, Weighted Average Exercise Price $ 8.12