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Note 6 - Borrowings From Officer (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Feb. 28, 2019
Feb. 07, 2019
Feb. 08, 2018
Dec. 31, 2017
Mar. 02, 2017
Feb. 09, 2017
Interest Payable, Current $ 479,000       $ 348,000    
Revolving Credit Facility [Member] | Chief Executive Officer [Member]              
Line of Credit Facility, Maximum Borrowing Capacity       $ 3,700,000   $ 3,700,000 $ 3,400,000
Line of Credit Facility, Interest Rate at Period End 6.50%            
Long-term Line of Credit, Total $ 1,815,000            
Interest Payable, Current $ 479,000            
Revolving Credit Facility [Member] | Chief Executive Officer [Member] | Prime Rate [Member]              
Debt Instrument, Basis Spread on Variable Rate 1.00%            
Revolving Credit Facility [Member] | Chief Executive Officer [Member] | Subsequent Event [Member]              
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,700,000 $ 2,700,000