Revolving credit line (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Schedule of Notes Payable

The following table summarizes our revolving credit line balances as of:

	March 31, 2018		December 31, 2017
Revolving credit line - 5.5 percent at March 31, 2018 (prime plus .75 percent), due September 29, 2018	$	4,900,000	$	4,900,000
Total	$	4,900,000	$	4,900,000