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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
Preferred Stock [Member]
Series A-1 Convertible Preferred Stock [Member]
Preferred Stock [Member]
Series B-1 Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Series A-1 Convertible Preferred Stock [Member]
Series B-1 Convertible Preferred Stock [Member]
Total
Balance (in shares) at Dec. 31, 2017 62,596 105,000 7,691,324     62,596 105,000  
Balance at Dec. 31, 2017 $ 6 $ 11 $ 769 $ 80,829,001 $ (67,076,492)     $ 13,753,295
Issuance of common stock for directors’ fees (in shares) 8,421          
Issuance of common stock for directors’ fees $ 1 16,512     16,513
Share-based compensation (533,421)     (533,421)
Net loss (2,191,992)     (2,191,992)
Balance (in shares) at Mar. 31, 2018 62,596 44,580 9,493,936          
Balance at Mar. 31, 2018 $ 6 $ 5 $ 949 81,639,682 (69,028,467)     12,612,175
Adoption of ASC 606 240,017     240,017
Dividends declared on preferred stock (156,162)     (156,162)
Conversion of B-1 preferred stock to common stock (in shares) (60,420) 1,678,334          
Conversion of B-1 preferred stock to common stock $ (6) $ 168 (162)    
Conversion of dividends payable on B-1 preferred stock (in shares) 115,857          
Conversion of dividends payable on B-1 preferred stock $ 11 417,072     417,083
Share-based compensation 533,421     533,421
Balance (in shares) at Dec. 31, 2018 13,977,868      
Balance at Dec. 31, 2018 $ 1,398 85,599,140 (75,134,316)     10,466,222
Issuance of common stock for directors’ fees (in shares) 13,820          
Issuance of common stock for directors’ fees $ 1 16,505     16,506
Share-based compensation 509,528     509,528
Net loss (1,803,508)     (1,803,508)
Balance (in shares) at Mar. 31, 2019 13,991,688          
Balance at Mar. 31, 2019 $ 1,399 86,125,173 (76,937,824)     9,188,748
Share-based compensation $ (509,528)     $ (509,528)