Note 13 - Summary of Quarterly Results of Operations (Details) - USD ($)	3 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Sales	$ 9,627,532	$ 11,902,391	$ 11,366,539	$ 10,837,158	$ 12,131,986	$ 9,323,158	$ 8,313,815	$ 6,119,733	$ 7,641,644	$ 6,372,108	$ 6,764,102	$ 7,899,497
Cable TV	3,078,967	4,144,607	4,243,512	3,831,803	4,291,007	3,220,055	2,231,167	1,863,227	2,372,386	1,851,855	1,866,352	2,618,724
Income from continuing operations	$ 210,588	$ 637,134	$ 234,255	$ 415,923	$ 619,358	$ 143,726	$ (243,264)	$ 139,369	$ 548,654	$ 269,984	$ 292,994	$ 660,291
Net income (loss) (in dollars per share)	$ 0.02	$ 0.06	$ 0.02	$ 0.04	$ 0.06	$ 0.01	$ (0.02)	$ 0.01	$ 0.05	$ 0.03	$ 0.03	$ 0.07
Diluted earnings from continuing operations per common share (in dollars per share)	$ 0.02	$ 0.06	$ 0.02	$ 0.04	$ 0.06	$ 0.01	$ (0.02)	$ 0.01	$ 0.05	$ 0.03	$ 0.03	$ 0.07