Shareholders Equity (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Balance, amount			$ 23,502,000	$ 24,131,000
Stock option expense			72,000	215
Purchase of shares for cancellation, value				(4,000)
Net Income (Loss)	$ (668,000)	$ 255,000	(1,196,000)	(352,000)
Issuance of shares - ATM, net, value			33,000
Issuance of shares - option exercises, value			83,000
Balance, amount	$ 22,494,000	$ 23,990,000	$ 22,494,000	$ 23,990,000
Common Stock
Balance, shares			58,108,366	58,133,066
Balance, amount			$ 581,000	$ 581,000
Purchase of shares for cancellation, shares				(21,100)
Issuance of shares - ATM, net, value			$ 2,000
Issuance of shares - option exercises, shares			185,000
Issuance of shares - option exercises, value			$ 1,000
Balance, shares	58,443,766	58,111,966	58,443,766	58,111,966
Balance, amount	$ 584,000	$ 581,000	$ 584,000	$ 581,000
Additional Paid-in Capital
Balance, amount			70,514,000	70,204,000
Stock option expense			72,000	215,000
Purchase of shares for cancellation, value				(4,000)
Issuance of shares - ATM, net, value			31,000
Issuance of shares - option exercises, value			82,000
Balance, amount	70,699,000	70,415,000	70,699,000	70,415,000
Accumulated Deficit
Balance, amount			(47,593,000)	(46,654,000)
Stock option expense			0	0
Purchase of shares for cancellation, value				0
Net Income (Loss)			(1,196,000)	(352,000)
Issuance of shares - ATM, net, value			0
Issuance of shares - option exercises, value			0
Balance, amount	$ (48,789,000)	$ (47,006,000)	$ (48,789,000)	$ (47,006,000)