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9. Fair Value of Financial Instruments (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Level 1 [Member]    
Assets    
Restricted cash and investments held in trust $ 142,027,742 $ 141,307,307
Cash and cash equivalents 826,525 1,503,500
Total assets 142,854,267 142,810,807
Liabilities    
Total Liabilities 0 0
Total Assets and Liablilties 142,854,267 142,810,807
Level 2 [Member]    
Assets    
Restricted cash and investments held in trust 0 0
Cash and cash equivalents 0 0
Total assets 0 0
Liabilities    
Total Liabilities 0 0
Total Assets and Liablilties 0 0
Level 3 [Member]    
Assets    
Restricted cash and investments held in trust 0 0
Cash and cash equivalents 0 0
Total assets 0 0
Liabilities    
Total Liabilities 0 0
Total Assets and Liablilties $ 0 $ 0