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STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
Common Stock
Additional Paid-In Capital
Retained Earnings (Accumulated Deficit)
Total
Beginning balance, shares at Dec. 31, 2018 11,840,000      
Beginning balance at Dec. 31, 2018 $ 118,000 $ 15,442,000 $ 760,000 $ 16,320,000
Issuance of common stock, net, shares 107,000      
Issuance of common stock, net $ 1,000 107,000   108,000
Value of stock-based compensation   138,000   138,000
Net loss (1,096,000) (1,096,000)
Ending balance, shares at Mar. 31, 2019 11,947,000      
Ending balance at Mar. 31, 2019 $ 119,000 15,687,000 (336,000) 15,470,000
Beginning balance, shares at Dec. 31, 2018 11,840,000      
Beginning balance at Dec. 31, 2018 $ 118,000 15,442,000 760,000 16,320,000
Repurchase of common stock upon vesting of restricted stock units, amount       (35,000)
Net loss       (2,562,000)
Ending balance, shares at Sep. 30, 2019 12,074,000      
Ending balance at Sep. 30, 2019 $ 121,000 15,890,000 (1,802,000) 14,209,000
Beginning balance, shares at Mar. 31, 2019 11,947,000      
Beginning balance at Mar. 31, 2019 $ 119,000 15,687,000 (336,000) 15,470,000
Value of stock-based compensation   139,000   139,000
Repurchase of common stock upon vesting of restricted stock units, shares 98,000      
Repurchase of common stock upon vesting of restricted stock units, amount $ 1,000 (10,000)   (9,000)
Net loss     (488,000) (488,000)
Ending balance, shares at Jun. 30, 2019 12,045,000      
Ending balance at Jun. 30, 2019 $ 120,000 15,816,000 (824,000) 15,112,000
Value of stock-based compensation   101,000   101,000
Repurchase of common stock upon vesting of restricted stock units, shares 29,000      
Repurchase of common stock upon vesting of restricted stock units, amount $ 1,000 (27,000)   (26,000)
Net loss     (978,000) (978,000)
Ending balance, shares at Sep. 30, 2019 12,074,000      
Ending balance at Sep. 30, 2019 $ 121,000 15,890,000 (1,802,000) 14,209,000
Beginning balance, shares at Dec. 31, 2019 12,074,000      
Beginning balance at Dec. 31, 2019 $ 121,000 15,934,000 (4,261,000) 11,794,000
Issuance of common stock, net, shares 33,000      
Issuance of common stock, net   20,000   20,000
Value of stock-based compensation   49,000   49,000
Net loss (863,000) (863,000)
Ending balance, shares at Mar. 31, 2020 12,107,000      
Ending balance at Mar. 31, 2020 $ 121,000 16,003,000 (5,124,000) 11,000,000
Beginning balance, shares at Dec. 31, 2019 12,074,000      
Beginning balance at Dec. 31, 2019 $ 121,000 15,934,000 (4,261,000) 11,794,000
Repurchase of common stock upon vesting of restricted stock units, amount       (1,000)
Net loss       (3,429,000)
Ending balance, shares at Sep. 30, 2020 12,235,000      
Ending balance at Sep. 30, 2020 $ 122,000 16,106,000 (7,690,000) 8,538,000
Beginning balance, shares at Mar. 31, 2020 12,107,000      
Beginning balance at Mar. 31, 2020 $ 121,000 16,003,000 (5,124,000) 11,000,000
Value of stock-based compensation   59,000   59,000
Repurchase of common stock upon vesting of restricted stock units, shares 29,000      
Repurchase of common stock upon vesting of restricted stock units, amount $ 0     0
Net loss     (1,772,000) (1,772,000)
Ending balance, shares at Jun. 30, 2020 12,136,000      
Ending balance at Jun. 30, 2020 $ 121,000 16,062,000 (6,896,000) 9,287,000
Value of stock-based compensation   37,000   37,000
Repurchase of common stock upon vesting of restricted stock units, shares 88,000      
Repurchase of common stock upon vesting of restricted stock units, amount $ 1,000 (2,000)   (1,000)
Common stock issued for accrued liabilities, shares 11,000      
Common stock issued for accrued liabilities, amount $ 0 9,000   9,000
Net loss     (794,000) (794,000)
Ending balance, shares at Sep. 30, 2020 12,235,000      
Ending balance at Sep. 30, 2020 $ 122,000 $ 16,106,000 $ (7,690,000) $ 8,538,000