Stockholders Equity (Details) - USD ($) shares in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Balance, amount			$ 23,628,000				$ 23,628,000
Balance, amount	$ 33,244,000			$ 22,649,000			33,244,000	$ 22,649,000
Common stock issued, net of issuance costs, amount		$ 11,559,000
Share-based compensation expense-restricted stock units							162,000	112,000
Net income (loss):	(2,566,000)			790,000			(1,398,000)	(970,000)
Common Stock [Member]
Balance, amount	$ 10,941,000	8,392,000	8,377,000	$ 8,366	$ 8,357,000	$ 8,357,000	$ 8,377,000	$ 8,357,000
Balance, amount		10,941,000	$ 8,392,000		$ 8,366	$ 8,357,000
Common stock issued, net of issuance costs, amount		$ 2,549,000
Balance, shares	18,236,121	13,986,871	13,962,366	13,943,820	13,929,381	13,929,381	13,962,366	13,929,381
Share-based compensation expense-stock options	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Share-based compensation expense-restricted stock units	0	0	0	0	0	0
Common stock dividends ($0.02 per share)	0		0	0	0	0
Net income (loss):	$ 0	$ 0	$ 0	$ 0	0	0
Repurchase of common stock					$ 0	0
Common stock issued under restricted stock units, shares	28,615		24,505	18,546	14,439
Common stock issued under restricted stock units, amount	$ 17,000		$ 15,000	$ 11,000	$ 9,000
Common stock issued, net of issuance costs, shares		4,249,250
Balance ending, shares	18,264,736			13,962,366		13,929,381
Balance ending, amount	10,958			8,377		8,357
Additional Paid-In Capital [Member]
Balance, amount	35,534,000	$ 26,466,000	26,346,000	26,235,000	26,146,000	26,095,000	$ 26,346,000	$ 26,095,000
Balance, amount		35,534,000	26,466,000		26,235,000	26,146,000
Common stock issued, net of issuance costs, amount		9,010,000
Share-based compensation expense-stock options	150,000	33,000	32,000	34,000	30,000	30,000
Share-based compensation expense-restricted stock units	34,000	25,000	103,000	23,000	68,000	21,000
Common stock dividends ($0.02 per share)	0		0	0	0	0
Net income (loss):	0	0	0	0	0	0
Repurchase of common stock					0	0
Common stock issued under restricted stock units, amount	(17,000)		(15,000)	(11,000)	(9,000)
Balance ending, amount	35,071			26,281		26,095
Retained Earnings (Accumulated Deficit) [Member]
Balance, amount	(4,776,000)	(6,614,000)	(5,693,000)	(7,147,000)	(6,601,000)	(6,043,000)	(5,693,000)	(6,043,000)
Balance, amount		(4,776,000)	(6,614,000)		(7,147,000)	(6,601,000)
Common stock issued, net of issuance costs, amount		0
Share-based compensation expense-stock options	0	0	0	0	0	0
Share-based compensation expense-restricted stock units	0	0	0	0	0	0
Common stock dividends ($0.02 per share)	(671,000)		(251,000)	(250,000)	(252,000)	(250,000)
Net income (loss):	(2,566,000)	1,838,000	(670,000)	790,000	(294,000)	(1,466,000)
Repurchase of common stock					0	0
Common stock issued under restricted stock units, amount	0		0	0	0
Balance ending, amount	(8,013)			(6,607)		(4,885)
Change in inventory accounting method						1,158,000
Treasury Stock [Member]
Balance, amount	(5,402,000)	(5,402,000)	(5,402,000)	(5,402,000)	(5,376,000)	(5,133,000)	(5,402,000)	(5,133,000)
Balance, amount		(5,402,000)	(5,402,000)		(5,402,000)	(5,376,000)
Common stock issued, net of issuance costs, amount		0
Share-based compensation expense-stock options	0	0	0	0	0	0
Share-based compensation expense-restricted stock units	0	0	0	0	0	0
Common stock dividends ($0.02 per share)	0		0	0	0	0
Net income (loss):	0	0	0	0	0	0
Repurchase of common stock					(26,000)	(243,000)
Common stock issued under restricted stock units, amount	0		0	0	0
Balance ending, amount	(5,402)			(5,402)
Total [Member]
Balance, amount	36,297,000	22,842,000	23,628,000	22,052,000	22,526,000	23,276,000	$ 23,628,000	$ 23,276,000
Balance, amount		36,297,000	22,842,000		22,052,000	22,526,000
Share-based compensation expense-stock options	150,000	33,000	32,000	34,000	30,000	30,000
Share-based compensation expense-restricted stock units	34,000	25,000	103,000	23,000	68,000	21,000
Common stock dividends ($0.02 per share)	(671,000)		(251,000)	(250,000)	(252,000)	(250,000)
Net income (loss):	(2,566,000)	$ 1,838,000	(670,000)	790,000	(294,000)	(1,466,000)
Repurchase of common stock					(26,000)	(243,000)
Common stock issued under restricted stock units, amount	0		$ 0	$ 0	$ 0
Balance ending, amount	$ 33,244
Change in inventory accounting method						$ 1,158,000