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Note 9 - Lines of Credit (Details Textual)
1 Months Ended
Nov. 04, 2019
USD ($)
Apr. 18, 2019
USD ($)
Jul. 01, 2016
USD ($)
Jan. 31, 2018
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Nov. 14, 2012
USD ($)
East West Bank [Member]              
Repayments of Senior Debt, Total   $ 6,111,692          
East West Bank [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity   $ 25,000,000          
Repayments of Long-term Lines of Credit $ 13,864,481            
Long-term Line of Credit, Total           $ 11,864,481  
East West Bank [Member] | Revolving Credit Facility [Member] | Minimum [Member]              
Line of Credit Facility, Interest Rate at Period End   4.214%       4.625%  
East West Bank [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]              
Debt Instrument, Basis Spread on Variable Rate   (0.375%)          
East West Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Basis Spread on Variable Rate   2.20%          
JP Morgan [Member] | Amended and Restated Credit Agreement [Member] | Mortgage-Secured Term Loans [Member]              
Line of Credit Facility, Maximum Borrowing Capacity $ 100,000,000            
Long-term Line of Credit, Total         $ 41,600,000    
Fixed Charge Coverage Ratio Required 1.1            
Han Feng, Inc. ("Han Feng") [Member] | Line of Credit Agreement [Member] | East West Bank [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity     $ 14,500,000        
Repayments of Long-term Lines of Credit   $ 5,156,018          
Han Feng, Inc. ("Han Feng") [Member] | Line of Credit Agreement [Member] | East West Bank [Member] | Revolving Credit Facility [Member] | Maximum [Member]              
Debt Instrument, Interest Rate, Stated Percentage     3.25%        
Han Feng, Inc. ("Han Feng") [Member] | Line of Credit Agreement [Member] | East West Bank [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]              
Debt Instrument, Basis Spread on Variable Rate     0.15%        
New Southern Food Distributors, Inc. ("NSF") [Member] | Line of Credit Agreement [Member] | Bank of America [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity             $ 4,000,000
Repayments of Long-term Lines of Credit   $ 954,984          
New Southern Food Distributors, Inc. ("NSF") [Member] | Line of Credit Agreement [Member] | Bank of America [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Basis Spread on Variable Rate       2.75%