Note 3. Segment Information (Details) - Net Sales Based on the Geographic Location of the External Customer (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012
Note 3. Segment Information (Details) - Net Sales Based on the Geographic Location of the External Customer [Line Items]
Net Sales (in Dollars)	$ 4,200	$ 3,952	$ 3,739	$ 3,396	$ 4,591	$ 4,314	$ 4,025	$ 3,756	$ 15,287	$ 16,686
Percentage of Net Sales									100.00%	100.00%
United States [Member]
Note 3. Segment Information (Details) - Net Sales Based on the Geographic Location of the External Customer [Line Items]
Net Sales (in Dollars)									10,296	11,349
Percentage of Net Sales									67.00%	68.00%
Europe [Member]
Note 3. Segment Information (Details) - Net Sales Based on the Geographic Location of the External Customer [Line Items]
Net Sales (in Dollars)									3,527	3,700
Percentage of Net Sales									23.00%	22.00%
Canada [Member]
Note 3. Segment Information (Details) - Net Sales Based on the Geographic Location of the External Customer [Line Items]
Net Sales (in Dollars)									471	303
Percentage of Net Sales									3.00%	2.00%
Middle East and Africa [Member]
Note 3. Segment Information (Details) - Net Sales Based on the Geographic Location of the External Customer [Line Items]
Net Sales (in Dollars)									468	371
Percentage of Net Sales									3.00%	2.00%
Asia and Australia [Member]
Note 3. Segment Information (Details) - Net Sales Based on the Geographic Location of the External Customer [Line Items]
Net Sales (in Dollars)									345	885
Percentage of Net Sales									2.00%	5.00%
Central and South America [Member]
Note 3. Segment Information (Details) - Net Sales Based on the Geographic Location of the External Customer [Line Items]
Net Sales (in Dollars)									$ 180	$ 78
Percentage of Net Sales									2.00%	1.00%