Note 7 - Segments, Major Customers and Geographic Information - Segment Reporting (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Operating Segments [Member] | DPC [Member]
Revenues	$ 1,248,000	$ 808,000	$ 3,408,000	$ 2,795,000
Intersegment revenues	27,000	155,000	89,000	277,000
Total Revenues by Major Customer	1,275,000	963,000	3,497,000	3,072,000
Depreciation and amortization expense	19,000	19,000	57,000	56,000
Operating income (loss)	34,000	(316,000)	(147,000)	(845,000)
Impairment of investment
Financial income (expense), net	(2,000)	(4,000)	(12,000)	(4,000)
Tax
Net loss	32,000	(320,000)	(159,000)	(849,000)
Expenditures for segment assets		4,000	23,000	54,000
Total assets	2,084,000	2,252,000	2,084,000	2,252,000
Operating Segments [Member] | DPL [Member]
Revenues	578,000	607,000	2,195,000	2,667,000
Intersegment revenues
Total Revenues by Major Customer	578,000	607,000	2,195,000	2,667,000
Depreciation and amortization expense	21,000	36,000	66,000	118,000
Operating income (loss)	(117,000)	(101,000)	(125,000)	62,000
Impairment of investment				(106,000)
Financial income (expense), net	25,000	25,000	97,000	22,000
Tax	22,000		22,000
Net loss	(70,000)	(76,000)	(6,000)	(22,000)
Expenditures for segment assets	4,000	21,000	51,000	76,000
Total assets	2,371,000	2,930,000	2,371,000	2,930,000
Intersegment Eliminations [Member]
Revenues
Intersegment revenues	(27,000)	(155,000)	(89,000)	(277,000)
Total Revenues by Major Customer	(27,000)	(155,000)	(89,000)	(277,000)
Depreciation and amortization expense
Operating income (loss)
Impairment of investment
Financial income (expense), net
Tax
Net loss
Expenditures for segment assets
Total assets
Revenues	1,826,000	1,415,000	5,603,000	5,462,000
Intersegment revenues
Total Revenues by Major Customer	1,826,000	1,415,000	5,603,000	5,462,000
Depreciation and amortization expense	40,000	55,000	123,000	174,000
Operating income (loss)	(83,000)	(417,000)	(272,000)	(783,000)
Impairment of investment				(106,000)
Financial income (expense), net	23,000	21,000	85,000	18,000
Tax	22,000		22,000
Net loss	(38,000)	(396,000)	(165,000)	(871,000)
Expenditures for segment assets	4,000	25,000	74,000	130,000
Total assets	$ 4,455,000	$ 5,182,000	$ 4,455,000	$ 5,182,000	$ 5,099,000