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Note 4 - Loan Payable to Officer (Details Textual) - Revolving Credit Facility [Member] - Chief Executive Officer [Member] - USD ($)
6 Months Ended
Jun. 14, 2017
Jun. 03, 2017
Jun. 30, 2017
Mar. 02, 2017
Feb. 09, 2017
Line of Credit Facility, Maximum Borrowing Capacity       $ 3,700,000 $ 3,400,000
Line of Credit Facility, Interest Rate at Period End     5.25%    
Long-term Line of Credit     $ 3,025,000    
Interest Payable, Current     $ 271,000    
Prime Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 4.25% 4.00% 1.00%