Note 1 - Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended			24 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Available-for-sale Securities	$ 5,121,000	$ 4,854,000		$ 4,854,000
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	4,600,000	4,700,000		4,700,000
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	500,000	200,000		200,000
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax	(3,000)	1,000
Sales Returns and Allowances, Goods	28,000	22,000	25,000
Inventory Write-down	120,000	57,000	60,000
Tangible Asset Impairment Charges	0	0		0
Unbilled Receivables, Current	46,000	77,000		77,000
Standard Product Warranty Accrual	20,000	15,000		15,000
Investment Income, Interest	12,000	34,000	46,000
Interest Expense	5,000	9,000	24,000
Advertising Expense	$ 1,000	$ 9,000	$ 6,000
Minimum [Member] | Computer Software, Intangible Asset [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member] | Computer Software, Intangible Asset [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	5 years