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Note 1 - Basis of Presentation (Details Textual) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 25,000 282,000 25,000 178,000
Employee Stock Options and Warrants [Member]        
Common Stock, Capital Shares Reserved for Future Issuance 471,000 205,000 471,000 205,000