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Stock Plans And Stock-Based Compensation (Details) - USD ($) | 3 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Stock-based compensation expense | $ 0 | $ 0
Intrinsic value of stock options exercised | $ 0 | $ 16,000
1998 and 2003 Stock Option Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used | The fair value of each stock option granted is estimated on the date of grant using the Black-Scholes stock option valuation model. |

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- Definition Represents the monetary amount of Intrinsic value of stock options exercised, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the monetary amount of Stock-based compensation expense, during the indicated time period. + References No definition available. + Details
Name: | fil_PreTaxCompensationExpenseRelatedToStockOptions
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Balance Type: | na
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- Details
Name: | us-gaap_PlanNameAxis=fil_N1998And2003StockOptionPlanMember
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Data Type: | na
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Period Type: |