Note 7 - Segments, Major Customers and Geographic Information (Detail) - Segment Reporting (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues	$ 2,189	$ 2,240
Operating income (loss)	14	116
Tax expense	0	12
Net income (loss)	107	75
DPC [Member]
Revenues	1,132	1,411
Intersegment revenues	38	128
Total revenues	1,170	1,539
Depreciation and amortization expense	8	12
Operating income (loss)		112
Net income (loss)		108
Expenditures for segment assets	33	14
Identifiable assets	3,887	3,749
DPL [Member]
Revenues	1,057	829
Intersegment revenues	0	2
Total revenues	1,057	831
Depreciation and amortization expense	40	37
Operating income (loss)	14	4
Net income (loss)	107	(33)
Expenditures for segment assets	17	6
Identifiable assets	3,228	3,308
Intersegment Elimination [Member]
Intersegment revenues	(38)	(130)
Total revenues	(38)	(130)
Total [Member]
Revenues	2,189	2,240
Total revenues	2,189	2,240
Depreciation and amortization expense	48	49
Operating income (loss)	14	116
Other income (expense), net	93	29
Tax expense		12
Net income (loss)	107	75
Expenditures for segment assets	50	20
Identifiable assets	$ 7,115	$ 7,057