Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Outstanding (in shares) at Dec. 31, 2020	39,747,659	(12,253,502)
Balance at Dec. 31, 2020	$ 39,748	$ (18,929,915)	$ 98,013,079	$ (50,676,351)	$ 28,446,561
Stock-based compensation expense	$ 0	$ 0	421,071	0	421,071
Issuance of common stock upon exercise of stock options (in shares)	60,000	0
Issuance of common stock upon exercise of stock options	$ 60	$ 0	115,740	0	115,800
Net loss	$ 0	$ 0	0	(3,294,949)	(3,294,949)
Outstanding (in shares) at Mar. 31, 2021	39,807,659	(12,253,502)
Balance at Mar. 31, 2021	$ 39,808	$ (18,929,915)	98,549,890	(53,971,300)	25,688,483
Outstanding (in shares) at Dec. 31, 2021	40,482,659	(12,253,502)
Balance at Dec. 31, 2021	$ 40,483	$ (18,929,915)	101,026,496	(63,746,602)	18,390,462
Stock-based compensation expense	$ 0	$ 0	453,791	0	$ 453,791
Issuance of common stock upon exercise of stock options (in shares)	35,000	0			35,000
Issuance of common stock upon exercise of stock options	$ 35	$ 0	42,315	0	$ 42,350
Net loss	$ 0	$ 0	0	(2,491,665)	(2,491,665)
Outstanding (in shares) at Mar. 31, 2022	40,517,659	(12,253,502)
Balance at Mar. 31, 2022	$ 40,518	$ (18,929,915)	$ 101,522,602	$ (66,238,267)	$ 16,394,938