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Note 7 - Borrowings From Officer (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2017
Feb. 28, 2018
Feb. 08, 2018
Mar. 02, 2017
Feb. 09, 2017
Dec. 31, 2016
Interest Payable, Current $ 348,000         $ 184,000
Revolving Credit Facility [Member] | Chief Executive Officer [Member]            
Line of Credit Facility, Maximum Borrowing Capacity       $ 3,700,000 $ 3,400,000  
Line of Credit Facility, Interest Rate at Period End 5.50%          
Long-term Line of Credit $ 2,865,000          
Interest Payable, Current $ 348,000          
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   $ 3,700,000 $ 3,700,000