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Note 4 - Debt (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
Sep. 11, 2018
Jul. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Apr. 11, 2018
Dec. 31, 2017
Proceeds from Life Insurance Policy   $ 3,070,000 $ 3,066,193    
Repayments of Debt   $ 2,860,000        
Line of Credit, Current         $ 500,000
Revolving Credit Facility [Member]            
Line of Credit Facility, Maximum Borrowing Capacity $ 750,000       $ 2,000,000  
Line of Credit, Current     $ 0      
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate 2.25%