Note 1. Description of Business (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Feb. 09, 2017	Sep. 30, 2016	Feb. 04, 2016	Dec. 31, 2014
Minimum Number of Years During Which Local Area Networking Equipment is Provided	15 years
Cash and Cash Equivalents, at Carrying Value	$ 64,000	$ 102,000				$ 1,006,000
Net Income (Loss) Attributable to Parent	$ (1,552,000)	$ (1,249,000)
Revolving Credit Facility [Member] | Chief Executive Officer [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 2,700,000	$ 2,200,000
Revolving Credit Facility [Member] | Chief Executive Officer [Member] | Subsequent Event [Member]
Line of Credit Facility, Current Borrowing Capacity			$ 515,000
Line of Credit Facility, Maximum Borrowing Capacity			$ 3,400,000