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Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock, Common [Member]
Deferred Compensation, Share-Based Payments [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2021 26,807,145          
Balance at Dec. 31, 2021 $ 195,235 $ 93,100,129 $ (2,404,458) $ (6,842,195) $ (65,379,805) $ 18,668,906
Issuance of common stock under equity incentive plan (in shares) 61,600          
Issuance of common stock under equity incentive plan $ 62 267,856 0 (12,330) 0 255,588
Deferred compensation amortization 0 0 0 295,092 0 295,092
Purchase of treasury stock costs 0 0 (66,494) 0 0 (66,494)
Net income (loss) 0 0 0 0 (1,622,270) (1,622,270)
Warrant compensation costs $ 0 8,985 0 0 0 8,985
Balance (in shares) at Mar. 31, 2022 26,868,745          
Balance at Mar. 31, 2022 $ 195,297 93,376,970 (2,470,952) (6,559,433) (67,002,075) 17,539,807
Balance (in shares) at Dec. 31, 2021 26,807,145          
Balance at Dec. 31, 2021 $ 195,235 93,100,129 (2,404,458) (6,842,195) (65,379,805) 18,668,906
Net income (loss)           (3,562,615)
Balance (in shares) at Jun. 30, 2022 26,837,978          
Balance at Jun. 30, 2022 $ 195,264 93,468,126 (2,951,047) (6,167,870) (68,942,420) 15,602,053
Balance (in shares) at Mar. 31, 2022 26,868,745          
Balance at Mar. 31, 2022 $ 195,297 93,376,970 (2,470,952) (6,559,433) (67,002,075) 17,539,807
Issuance of common stock under equity incentive plan (in shares) 54,233          
Issuance of common stock under equity incentive plan $ 52 258,636 0 0 0 258,688
Deferred compensation amortization 0 0 0 293,942 0 293,942
Purchase of treasury stock costs 0 0 (480,095) 0 0 (480,095)
Net income (loss) $ 0 0 0 0 (1,940,345) (1,940,345)
Reversal of deferred compensation amortization that did not vest (in shares) (85,000)          
Reversal of deferred compensation amortization that did not vest $ (85) (176,465) 0 97,621 0 (78,929)
Warrant compensation costs $ 0 8,985 0 0 0 8,985
Balance (in shares) at Jun. 30, 2022 26,837,978          
Balance at Jun. 30, 2022 $ 195,264 93,468,126 (2,951,047) (6,167,870) (68,942,420) 15,602,053
Balance (in shares) at Dec. 31, 2022 27,044,900          
Balance at Dec. 31, 2022 $ 195,471 94,048,603 (3,749,027) (5,697,900) (70,863,049) 13,934,098
Issuance of common stock under equity incentive plan (in shares) 1,421,250          
Issuance of common stock under equity incentive plan $ 1,421 2,638,529 0 (2,444,054) 0 195,896
Deferred compensation amortization       308,676   308,676
Purchase of treasury stock costs 0 0 (8,529) 0 0 (8,529)
Net income (loss) $ 0 0 0 0 14,833 14,833
Balance (in shares) at Mar. 31, 2023 28,466,150          
Balance at Mar. 31, 2023 $ 196,892 96,687,132 (3,757,556) (7,833,278) (70,848,216) 14,444,974
Balance (in shares) at Dec. 31, 2022 27,044,900          
Balance at Dec. 31, 2022 $ 195,471 94,048,603 (3,749,027) (5,697,900) (70,863,049) 13,934,098
Net income (loss)           219,874
Balance (in shares) at Jun. 30, 2023 28,462,606          
Balance at Jun. 30, 2023 $ 196,888 96,853,243 (3,924,225) (7,421,516) (70,643,175) 15,061,215
Balance (in shares) at Mar. 31, 2023 28,466,150          
Balance at Mar. 31, 2023 $ 196,892 96,687,132 (3,757,556) (7,833,278) (70,848,216) 14,444,974
Issuance of common stock under equity incentive plan (in shares) 111,456          
Issuance of common stock under equity incentive plan $ 111 354,199 0 (34,452) 0 319,858
Deferred compensation amortization       343,123   343,123
Purchase of treasury stock costs 0 0 (10,507) 0 0 (10,507)
Net income (loss) $ 0 0 0 0 205,041 205,041
Reversal of deferred compensation amortization that did not vest (in shares) (115,000)          
Reversal of deferred compensation amortization that did not vest $ (115) (188,088) 0 103,091 0 (85,112)
Non-cash return of common stock $ 0 0 (156,162) 0 0 (156,162)
Balance (in shares) at Jun. 30, 2023 28,462,606          
Balance at Jun. 30, 2023 $ 196,888 $ 96,853,243 $ (3,924,225) $ (7,421,516) $ (70,643,175) $ 15,061,215