XML 37 R26.htm IDEA: XBRL DOCUMENT v3.19.1
Amounts Outstanding under Bank Lines of Credit (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Lines of credit - domestic line $ 1,458,140  
Lines of credit - EXIM line 338,144  
Total lines of credit $ 1,796,284 $ 1,316,778