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Note 3 - Loan Payable to Officer (Details Textual) - Revolving Credit Facility [Member] - Chief Executive Officer [Member] - USD ($)
9 Months Ended
Sep. 30, 2019
Oct. 24, 2019
Feb. 07, 2019
Feb. 08, 2018
Line of Credit Facility, Maximum Borrowing Capacity     $ 2,700,000 $ 3,700,000
Debt Instrument, Basis Spread on Variable Rate 1.00%      
Long-term Line of Credit, Total $ 0      
Subsequent Event [Member]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 0