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Note 6 - Debt (Details Textual) - USD ($)
1 Months Ended
Mar. 25, 2019
Sep. 11, 2018
Jul. 30, 2018
Sep. 30, 2019
Jan. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Line of Credit, Current       $ 500,000    
Cash Surrender Value of Life Insurance, Current             $ 3,070,000
Repayments of Debt     $ 2,860,000        
Revolving Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity $ 750,000 $ 750,000   750,000 $ 750,000    
Line of Credit, Current       $ 500,000 $ 500,000 $ 0  
Debt Instrument, Interest Rate, Stated Percentage       5.07%      
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Basis Spread on Variable Rate 3.00% 2.25%