Statements of Stockholders' Equity - USD ($)	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings / (Accumulated Deficit)	Total
Balance at Dec. 31, 2018	$ 6,000	$ 0	$ 25,608,000	$ (21,418,000)	$ 4,196,000
Balance (in shares) at Dec. 31, 2018	6,349,985	(25,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Warrant Re-purchase	$ 0	$ 0	(2,687,000)	0	(2,687,000)
Warrant Exercises	$ 0	$ 0	0	0	0
Warrant Exercises (in shares)	36,197	0
Stock Option Exercises	$ 1,000	$ 0	59,000	0	60,000
Stock Option Exercises (in shares)	166,734	0
Stock-based Compensation	$ 0	$ 0	282,000	0	282,000
Net income	0	0	0	12,251,000	12,251,000
Balance at Sep. 30, 2019	$ 7,000	$ 0	23,262,000	(9,167,000)	14,102,000
Balance (in shares) at Sep. 30, 2019	6,552,916	(25,000)
Balance at Jun. 30, 2019	$ 6,000	$ 0	23,161,000	(16,946,000)	6,221,000
Balance (in shares) at Jun. 30, 2019	6,484,414	(25,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Warrant Exercises	$ 0	$ 0	0	0	0
Warrant Exercises (in shares)	13,670	0
Stock Option Exercises	$ 1,000	$ 0	15,000	0	16,000
Stock Option Exercises (in shares)	54,832	0
Stock-based Compensation	$ 0	$ 0	86,000	0	86,000
Net income	0	0	0	7,779,000	7,779,000
Balance at Sep. 30, 2019	$ 7,000	$ 0	23,262,000	(9,167,000)	14,102,000
Balance (in shares) at Sep. 30, 2019	6,552,916	(25,000)
Balance at Dec. 31, 2019	$ 7,000	$ 0	19,400,000	(6,334,000)	13,073,000
Balance (in shares) at Dec. 31, 2019	6,556,221	(25,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee Stock Grant	$ 0	$ 0	0	0	0
Employee Stock Grant (in shares)	641	0
Stock Option Exercises	$ 0	$ 0	174,000	0	$ 174,000
Stock Option Exercises (in shares)	83,971	0			85,226
Stock-based Compensation	$ 0	$ 0	190,000	0	$ 190,000
Net income	0	0	0	8,614,000	8,614,000
Balance at Sep. 30, 2020	$ 7,000	$ 0	19,764,000	2,280,000	22,051,000
Balance (in shares) at Sep. 30, 2020	6,640,833	(25,000)
Balance at Jun. 30, 2020	$ 7,000	$ 0	19,598,000	(2,586,000)	17,019,000
Balance (in shares) at Jun. 30, 2020	6,588,176	(25,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee Stock Grant	$ 0	$ 0	0	0	0
Employee Stock Grant (in shares)	641	0
Stock Option Exercises	$ 0	$ 0	104,000	0	104,000
Stock Option Exercises (in shares)	52,016	0
Stock-based Compensation	$ 0	$ 0	62,000	0	62,000
Net income	0	0	0	4,866,000	4,866,000
Balance at Sep. 30, 2020	$ 7,000	$ 0	$ 19,764,000	$ 2,280,000	$ 22,051,000
Balance (in shares) at Sep. 30, 2020	6,640,833	(25,000)