Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Details
Expected tax at U.S. statutory rate	$ 838,000	$ 1,206,000
Expected tax at U.S. statutory rate, %	34.00%	34.00%
Impact of the Act	$ (432,000)
Impact of the Act, %	(17.50%)
Permanent differences	$ (39,000)	$ (49,000)
Permanent differences, %	(1.60%)	(1.40%)
State taxes, net of federal benefit	$ 20,000	$ 34,000
State taxes, net of federal benefit, %	0.80%	1.00%
Income tax expense	$ 387,000	$ 1,191,000
Income tax expense, %	15.70%	33.60%