Note 1 - Organization and Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended	141 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014
Note 1 - Organization and Summary of Significant Accounting Policies (Details) [Line Items]
Number of Operating Segments	2us-gaap_NumberOfOperatingSegments
Marketable Securities	$ 463,000us-gaap_MarketableSecurities		$ 463,000us-gaap_MarketableSecurities
Marketable Securities, Unrealized Gain (Loss)	20,000
Inventory Valuation Reserves	95,000us-gaap_InventoryValuationReserves	102,000us-gaap_InventoryValuationReserves	95,000us-gaap_InventoryValuationReserves
Operating Leases, Income Statement, Lease Revenue	617,000	1,566,000
Operating Leases, Future Minimum Payments Receivable	425,000	125,000	425,000
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments	145,000
Cost-method Investments, Other than Temporary Impairment	17,000
Gain on Sale of Investments	128,000us-gaap_GainOnSaleOfInvestments	1,000us-gaap_GainOnSaleOfInvestments
Equity Method Investments	913,000us-gaap_EquityMethodInvestments	914,000us-gaap_EquityMethodInvestments	913,000us-gaap_EquityMethodInvestments
Cost Method Investments	692,000us-gaap_CostMethodInvestments	736,000us-gaap_CostMethodInvestments	692,000us-gaap_CostMethodInvestments
Finite-Lived Intangible Asset, Useful Life	10 years
Product Warranty Accrual	122,000us-gaap_ProductWarrantyAccrual	141,000us-gaap_ProductWarrantyAccrual	122,000us-gaap_ProductWarrantyAccrual
Allocated Share-based Compensation Expense	49,000	82,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)	16,000	17,000	1,231,500
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	17,000		17,000
General and Administrative Expense [Member]
Note 1 - Organization and Summary of Significant Accounting Policies (Details) [Line Items]
Depreciation	353,000	386,000
Patents [Member]
Note 1 - Organization and Summary of Significant Accounting Policies (Details) [Line Items]
Amortization of Intangible Assets	45,000
Previously Written Off [Member]
Note 1 - Organization and Summary of Significant Accounting Policies (Details) [Line Items]
Gain on Sale of Investments		$ 1,000
The 2011 Non-employee Directors Stock Option Plan [Member]
Note 1 - Organization and Summary of Significant Accounting Policies (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)	16,000	17,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 1.06	$ 1.05

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.