Note 5 - Revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information, Description of Products and Services			The Company product revenue includes industrial wireless products and accessories such as antennas, power supplies and cable assemblies. The Company also provides direct site support and engineering services to customers, such as repair and upgrade of its products.
Product Sales	$ 448,403	$ 244,397	$ 870,079	$ 497,364
Site Support Sales	8,600	1,100	11,700	22,100
SALES - NET	457,003	245,497	881,779	519,464
Sales order backlog			17,143	4,118
Domestic
SALES - NET	432,215	212,264	794,330	454,239
Foreign
SALES - NET	$ 24,788	$ 33,233	$ 87,449	$ 65,225