Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2020
Oct. 11, 2021
Jun. 30, 2020
Document Information Line Items      
Trading Symbol PME    
Document Type 10-K    
Current Fiscal Year End Date --12-31    
Entity Common Stock, Shares Outstanding   85,940,965  
Entity Public Float     $ 39,000,000
Amendment Flag false    
Entity Central Index Key 0001517130    
Entity Current Reporting Status No    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Document Annual Report true    
Document Transition Report false    
Entity Incorporation, State or Country Code E9    
Entity File Number 001-35192    
Entity Tax Identification Number 00-0000000    
Entity Address, Address Line One 18-19/F    
Entity Address, Address Line Two Zhongshan Building A    
Entity Address, Address Line Three No. 154 Hudong Road    
Entity Address, City or Town Fuzhou    
Entity Address, Country CN    
Entity Address, Postal Zip Code 350001    
City Area Code (86)    
Local Phone Number 591-8727-1266    
Title of 12(b) Security Ordinary Shares, $0.001 par value    
Security Exchange Name NASDAQ    
Entity Interactive Data Current Yes