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Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 10,638,000 10,318,000
Common stock, shares outstanding 10,097,000 9,784,000
Treasury stock, shares at cost 541,000 534,000