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Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
Mar. 31, 2025
Dec. 31, 2024
Current assets:    
Cash and cash equivalents $ 5,064,941 $ 6,506,750
Short-term investment securities 2,284,472 2,756,577
Interest receivable 23,213 24,248
Accounts receivable 221,719 237,027
Prepaid expenses and other current assets 210,867 303,066
Total current assets 7,805,212 9,827,668
Non-current assets:    
Operating lease right-of-use asset, net 79,229 92,211
Other assets 10,437 10,396
Total assets 7,894,878 9,930,275
Current liabilities:    
Accounts payable 448,390 482,320
Accrued Liabilities, Current 690,859 970,462
Deferred research and development obligations 665,216 833,813
Operating lease liability, current portion 55,895 54,249
Total current liabilities 1,962,160 2,448,017
Non-current liabilities:    
Operating lease liability, net of current portion 19,998 34,621
Total liabilities 6,971,267 7,459,985
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 - 42,367,748 and 42,089,301, outstanding shares - 30,090,661 and 29,835,799 as of March 31, 2025, and December 31, 2024, respectively 42,368 42,090
Additional paid-in capital 107,925,217 107,444,595
Treasury stock, shares held at cost - 12,253,502 (18,929,915) (18,929,915)
Accumulated deficit (88,114,059) (86,086,480)
Total stockholders’ equity 923,611 2,470,290
Total liabilities and stockholders’ equity 7,894,878 9,930,275
Nonrelated Party [Member]    
Current liabilities:    
Accrued interest 80,000 80,000
Non-current liabilities:    
Convertible notes, net of issuance costs 3,920,714 3,911,471
Related Party [Member]    
Current liabilities:    
Accrued interest 21,800 27,173
Non-current liabilities:    
Convertible notes, net of issuance costs $ 1,068,395 $ 1,065,876