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Note 1 - Basis of Presentation (Details Textual) - shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 4,100,000 600,000
Number of Shares Issuable Upon the Exercise of Options and Warrants (in shares) 632,660 471,000