1. Summary of Significant Accounting Policies (Details) (USD $) - USD ($)		3 Months Ended								12 Months Ended
		Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income (Numerator)
Net income (loss)		$ (2,981,000)	$ (1,177,000)	$ 581,000	$ 193,000	$ (260,000)	$ (993,000)	$ 31,000	$ 350,000	$ (3,384,927)	$ (870,840)	$ 785,778
Shares (Denominator)
Weighted average number of common shares outstanding, basic										20,783,032	20,781,886	20,517,846
Effect of dilutive securities: options										222,624	32,845	921,396
Effect of dilutive securities: convertible notes										4,698,630	393,442	0
Weighted average number of common shares outstanding, diluted										25,704,286	21,208,173	21,439,242
Per Share Amount
Earnings per share - basic		$ (.14)	$ (.06)	$ 0.03	$ 0.01	$ (0.01)	$ (0.05)	$ 0.00	$ 0.02	$ (.16)	$ (.04)	$ 0.04
Diluted earnings per share	[1]									$ (.16)	$ (.04)	$ 0.04

[1] In 2017, net loss per share is shown the same as basic loss per share because the underlying dilutive securities have an anti-dilutive effect.