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Consolidated Statements of Stockholders' Equity - USD ($)
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Balances at Dec. 31, 2016 $ 2,244,000 $ 1,000 $ 42,574,000 $ (40,331,000)
Balances (in shares) at Dec. 31, 2016   12,983,938    
Shares issued in rights offering ($3.03 per share) 7,258,000 $ 1,000 7,257,000 0
Shares issued in rights offering ($3.03 per share) (in shares)   2,395,471    
Warrants issued in rights offering ($0.97 per warrant) 2,324,000 $ 0 2,324,000 0
Issuance costs of rights offering (915,000) 0 (915,000) 0
Shares issued in payment of accrued compensation ($3.60 per share) 490,000 $ 0 490,000 0
Shares issued in payment of accrued compensation ($3.60 per share) (in shares)   136,110    
Shares issued for services ($4.85 per share) 24,000 $ 0 24,000 0
Shares issued for services ($4.85 per share) (in shares)   5,000    
Shares issued for services ($3.50 per share) 18,000   18,000  
Shares issued for services ($3.50 per share) (in shares)   5,000    
Shares issued for 2017 board services ($3.60 per share) 300,000 $ 0 300,000 0
Shares issued for 2017 board services ($3.60 per share) (In shares)   83,334    
Share Based Compensation 369,000 $ 0 369,000 0
Net loss (9,680,000) 0 0 (9,680,000)
Balances at Dec. 31, 2017 2,432,000 $ 2,000 52,441,000 (50,011,000)
Balances (in shares) at Dec. 31, 2017   15,608,853    
Shares issued in stock offerings ($2.25 per share) 24,668,000 $ 1,000 24,667,000 0
Shares issued in stock offerings ($2.25 per share) (in shares)   10,963,543    
Issuance costs of rights offering (1,157,000) $ 0 (1,157,000) 0
Shares issued for services ($3.50 per share) 26,000 $ 0 26,000 0
Shares issued for services ($3.50 per share) (in shares)   7,500    
Shares issued for services ($1.44 per share) 4,000 $ 0 4,000 0
Shares issued for services ($1.44 per share) (in shares)   2,500    
Shares issued for 2018 board service ($1.85 per share) 212,000 $ 0 212,000 0
Shares issued for 2018 board service ($1.85 per share) (in shares)   114,865    
Share Based Compensation 224,000 $ 0 224,000 0
Net loss (9,500,000) 0 0 (9,500,000)
Balances at Dec. 31, 2018 $ 16,909,000 $ 3,000 $ 76,417,000 $ (59,511,000)
Balances (in shares) at Dec. 31, 2018   26,697,261