Consolidated Condensed Statement of Changes in Stockholders’ Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock		Additional paid-in Capital		Accumulated deficit	Total
Beginning balances at Dec. 31, 2018	$ 664		$ 203,580		$ (199,115)	$ 5,129
Beginning balances (in Shares) at Dec. 31, 2018	66,405
Funds received from sale of DSPP units and shares	$ 115		5,521			5,636
Funds received from sale of DSPP units and shares (in Shares)	11,486
Value of bonds converted to shares		[1]	2			2
Value of bonds converted to shares (in Shares)	5
Bond interest paid in shares	$ 4		323			327
Bond interest paid in shares (in Shares)	422
Funds received from option exercises	$ 1					1
Funds received from option exercises (in Shares)	53
Value of options granted to employees, directors and others as non-cash compensation			40			40
Net loss					(3,483)	(3,483)
Ending balances at Jun. 30, 2019	$ 784		209,466		(202,598)	7,652
Ending balances (in Shares) at Jun. 30, 2019	78,371
Beginning balances at Mar. 31, 2019	$ 711		206,077		(201,285)	5,503
Beginning balances (in Shares) at Mar. 31, 2019	71,066
Funds received from sale of DSPP units and shares	$ 69		3,039			3,108
Funds received from sale of DSPP units and shares (in Shares)	6,878
Value of bonds converted to shares		[1]	2			2
Value of bonds converted to shares (in Shares)	5
Bond interest paid in shares	$ 4		323			327
Bond interest paid in shares (in Shares)	422
Value of options granted to employees, directors and others as non-cash compensation			25			25
Net loss					(1,313)	(1,313)
Ending balances at Jun. 30, 2019	$ 784		209,466		(202,598)	7,652
Ending balances (in Shares) at Jun. 30, 2019	78,371
Beginning balances at Dec. 31, 2019	$ 1,240		217,892		(205,808)	13,324
Beginning balances (in Shares) at Dec. 31, 2019	123,973
Funds received from sale of DSPP units and shares	$ 537		11,965			12,502
Funds received from sale of DSPP units and shares (in Shares)	53,765
Value of bonds converted to shares		[1]
Value of bonds converted to shares (in Shares)	1
Bond interest paid in shares	$ 18		307			325
Bond interest paid in shares (in Shares)	1,782
Funds received from option exercises	$ 4					4
Funds received from option exercises (in Shares)	388
Value of options granted to employees, directors and others as non-cash compensation			56			56
Net loss					(3,532)	(3,532)
Ending balances at Jun. 30, 2020	$ 1,799		230,220		(209,340)	22,679
Ending balances (in Shares) at Jun. 30, 2020	179,909
Beginning balances at Mar. 31, 2020	$ 1,647		226,654		(207,416)	20,885
Beginning balances (in Shares) at Mar. 31, 2020	164,691
Funds received from sale of DSPP units and shares	$ 134		3,259			3,393
Funds received from sale of DSPP units and shares (in Shares)	13,437
Value of bonds converted to shares		[1]		[1]			[1]
Value of bonds converted to shares (in Shares)	(1)
Bond interest paid in shares	$ 18		307			325
Bond interest paid in shares (in Shares)	1,782
Funds received from option exercises
Value of options granted to employees, directors and others as non-cash compensation
Net loss					(1,924)	(1,924)
Ending balances at Jun. 30, 2020	$ 1,799		$ 230,220		$ (209,340)	$ 22,679
Ending balances (in Shares) at Jun. 30, 2020	179,909

[1] Less than one thousand.