Share Based Compensation, Outstanding Stock Option Grants and Related Transactions (Details) - Stock Options [Member] $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($) $ / shares shares
Number of Shares [Roll Forward]
Outstanding, beginning balance (in shares)	121,189
Granted (in shares)	0
Exercised (in shares)	(37,450)
Forfeited (in shares)	0
Expired (in shares)	0
Outstanding, ending balance (in shares)	83,739
Vested and expected to vest, period end (in shares)	83,739
Exercisable, period end (in shares)	83,739
Average Exercise Price [Roll Forward]
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 4.81
Exercised (in dollars per share) | $ / shares	2.76
Outstanding, ending balance (in dollars per share) | $ / shares	5.72
Vested and expected to vest, period end (in dollars per share) | $ / shares	5.72
Exercisable, period end (in dollars per share) | $ / shares	$ 5.72
Weighted-Average Remaining Contractual Term (Years) [Abstract]
Outstanding, weighted average remaining contractual term	2 years 1 month 6 days
Vested and expected to vest, weighted-average remaining contractual term	2 years 1 month 6 days
Exercisable, weighted average remaining contractual term	2 years 1 month 6 days
Aggregate Intrinsic Value [Abstract]
Outstanding, aggregate intrinsic value | $	$ 1,339
Vested and expected to vest, aggregate intrinsic value | $	1,339
Exercisable, aggregate intrinsic value | $	$ 1,339