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Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Current assets:    
Cash and cash equivalents $ 10,569,814 $ 6,515,028
Short-term investment securities 1,468,002 748,290
Interest receivable 15,227 10,083
Accounts receivable 246,138 466,159
Prepaid expenses and other current assets 242,131 327,775
Total current assets 12,541,312 8,067,335
Non-current assets:    
Operating lease right-of-use asset, net 129,519 141,439
Other assets 10,435 10,462
Total assets 12,681,266 8,219,236
Current liabilities:    
Accounts payable 661,243 656,445
Accrued expenses 987,973 1,057,164
Deferred research and development obligations 534,018 490,113
Operating lease liability, current portion 49,551 48,059
Total current liabilities 2,262,119 2,251,781
Non-current liabilities:    
Operating lease liability, net of current portion 75,894 88,870
Total liabilities 8,165,464 2,340,651
Commitments and contingencies (Note 5)
Stockholders’ equity:    
Preferred stock, $.0001 par value: Authorized shares - 5,000,000; none issued and outstanding 0 0
Authorized shares - 100,000,000; issued shares - 41,440,316 and 41,064,563, outstanding shares - 29,186,814 and 28,811,061 as of March 31, 2024, and December 31, 2023, respectively 41,441 41,065
Additional paid-in capital 105,691,193 105,044,756
Treasury stock, shares held at cost - 12,253,502 (18,929,915) (18,929,915)
Accumulated deficit (82,286,917) (80,277,321)
Total stockholders’ equity 4,515,802 5,878,585
Total liabilities and stockholders’ equity 12,681,266 8,219,236
Nonrelated Party [Member]    
Current liabilities:    
Accrued interest 19,556 0
Non-current liabilities:    
Convertible notes, net of issuance costs 3,884,967 0
Related Party [Member]    
Current liabilities:    
Accrued interest 9,778 0
Non-current liabilities:    
Convertible notes, net of issuance costs $ 1,942,484 $ 0