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Stock-Based Compensation (Details Narrative) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Notes to Financial Statements          
Stock-based compensation expenses $ 137,035   $ 118,843   $ 259,000
Stock options granted   165,600      
Restricted stock granted   116,050   275,623