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Note 4 - Debt - Subsequent Events (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Jul. 31, 2018
Mar. 31, 2019
Jun. 30, 2018
Sep. 30, 2018
Dec. 31, 2018
Apr. 11, 2018
Dec. 31, 2017
Debt Instrument, Covenant Compliance, Minimum Net Tangible Worth       $ 9,500,000        
Line of Credit Facility, Covenant Compliance, Minimum Cumulative EBITDA       400,000        
Cash Surrender Value of Life Insurance, Current       3,067,360      
Loans Payable, Current, Total       2,355,861       2,545,421
Line of Credit, Current       500,000       500,000
Cash Surrender Value of Life Insurance             $ 3,086,522
Subsequent Event [Member]                
Repayments of Debt   $ 2,860,000            
Cash Surrender Value of Life Insurance   0            
Scenario, Forecast [Member]                
Line of Credit Facility, Covenant Compliance, Minimum Cumulative EBITDA     $ 200,000   $ 600,000 $ 800,000    
Revolving Credit Facility [Member]                
Line of Credit Facility, Maximum Borrowing Capacity $ 3,500,000           $ 2,000,000  
Long-term Line of Credit, Total       $ 500,000        
Term Loan [Member]                
Debt Instrument, Face Amount $ 3,250,000              
Debt Instrument, Amortization Term 10 years              
Debt Instrument, Periodic Payment, Principal $ 27,080              
Debt Instrument, Interest Rate, Effective Percentage       4.26%        
Term Loan [Member] | Subsequent Event [Member]                
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] | Subsequent Event [Member]                
Line of Credit, Current   $ 0