Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Stockholders' equity:
Common stock, par value	$ .00	$ .00
Common stock, authorized shares	40,000,000	40,000,000
Common stock, issued shares	22,215,512	21,783,131
Common stock, outstanding shares	22,215,512	21,783,131