Quarterly report pursuant to Section 13 or 15(d)

Revolving credit line - Schedule of Notes Payable (Details)

v3.8.0.1
Revolving credit line - Schedule of Notes Payable (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total $ 4,900,000 $ 4,900,000
Line of Credit | Revolving Credit Facility    
Debt Instrument [Line Items]    
Revolving credit line - 5.5 percent at March 31, 2018 (prime plus .75 percent), due September 29, 2018 $ 4,900,000 $ 4,900,000
Stated interest rate 5.50%  
Line of Credit | Revolving Credit Facility | Prime Rate    
Debt Instrument [Line Items]    
Basis spread on variable rate 0.75%