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Note 7 - Debt (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Sep. 11, 2018
Sep. 30, 2015
Mar. 28, 2019
Jul. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Mar. 25, 2019
Jan. 31, 2019
Apr. 11, 2018
Proceeds from Life Insurance Policy       $ 3,070,000 $ 3,066,193      
Repayments of Debt       2,860,000          
Cash Surrender Value of Life Insurance       0 3,086,522      
Line of Credit, Current         500,000      
Loans Payable, Current, Total         $ 2,545,421      
Revolving Credit Facility [Member]                  
Line of Credit Facility, Maximum Borrowing Capacity $ 750,000 $ 3,500,000             $ 2,000,000
Debt Instrument, Term   1 year              
Line of Credit, Current         $ 0        
Revolving Credit Facility [Member] | Subsequent Event [Member]                  
Line of Credit Facility, Maximum Borrowing Capacity             $ 750,000 $ 750,000  
Line of Credit, Current               $ 500,000  
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument, Basis Spread on Variable Rate 2.25% 2.25%              
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Subsequent Event [Member]                  
Debt Instrument, Basis Spread on Variable Rate     3.00%            
Term Loan [Member]                  
Debt Instrument, Face Amount   $ 3,250,000              
Debt Instrument, Term   3 years              
Debt Instrument, Amortization Term   10 years              
Debt Instrument, Periodic Payment, Principal   $ 27,080              
Loans Payable, Current, Total       0          
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument, Basis Spread on Variable Rate   2.25%              
Line of Credit [Member]                  
Line of Credit, Current       $ 0