Schedule of Non-qualified Stock Options (Details) - Non-Qualified Stock Option [Member] - $ / shares	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Summary of Investment Holdings [Line Items]
Number of Stock Options, Options outstanding, beginning of year	164,167	234,167
Weighted Exercise Price, Option outstanding, beginning of year	$ 3.13	$ 2.47
Number of Stock Options, Granted
Weighted Exercise Price, Granted
Number of Stock Options, Redeemed	(17,500)	(7,500)
Weighted Exercise Price, Redeemed	$ 1.21	$ 0.88
Number of Stock Options, Exercised	(5,000)	(15,000)
Weighted Exercise Price, Exercised	$ 1.21	$ 0.88
Number of Stock Options, Expired / terminated
Weighted Exercise Price, Expired / terminated
Number of Stock Options, Options outstanding, end of period	141,667	211,667
Weighted Exercise Price, Option outstanding end of period	$ 3.43	$ 2.64
Number of Stock Options, Options exercisable, end of period	141,667	211,667
Weighted Exercise Price, Options exercisable, end of period	$ 3.43	$ 2.64