Note F - Common Stock and Stock-based Compensation (Details) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	(158,500)	(20,000)
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 3,642	$ 17,584
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	78,000	15,000
Warrants granted	$ 0	$ 0
Vest one-third on each annual anniversary of the grant date
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	30,000	127,500
Stock Options Compensation	$ 322	$ 276
Vested during the year
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	4,000
Stock Options Compensation	$ 156
Related to options that were granted in prior years
Stock Options Compensation	$ 14,993	$ 22,313
In the same year
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	152,000	3,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	152,000	3,000
Related to options granted in prior years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	6,500	17,000

Represents the monetary amount of Stock Options Compensation, during the indicated time period.

No definition available.

Name:	fil_StockOptionsCompensation
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the per-share monetary value of Warrants granted, during the indicated time period.

+ References

No definition available.

+ Details

Name:	fil_WarrantsGranted
Namespace Prefix:	fil_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ 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 (c)(1)(iv)(4)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ 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 (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Net number of share options (or share units) granted during the period.

+ 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 (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	fil_EmployeeStockOptionsAxis=fil_VestOneThirdOnEachAnnualAnniversaryOfTheGrantDateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fil_EmployeeStockOptionsAxis=fil_VestedDuringTheYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fil_EmployeeStockOptionsAxis=fil_RelatedToOptionsThatWereGrantedInPriorYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fil_EmployeeStockOptionsAxis=fil_InTheSameYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fil_EmployeeStockOptionsAxis=fil_RelatedToOptionsGrantedInPriorYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: