Note 7 - Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 7 - Income Taxes (Details) [Line Items]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 3,300,000	$ 900,000	$ 1,400,000
Tax Credit Recorded to Additional Paid In Capital	4,200,000
Undistributed Earnings of Foreign Subsidiaries	2,600,000	2,600,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	33,000	33,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	41,000	37,000
Domestic Tax Authority [Member]
Note 7 - Income Taxes (Details) [Line Items]
Operating Loss Carryforwards	34,300,000
Operating Loss Carryforwards, Expiration Date	2033
Deferred Tax Assets, Tax Credit Carryforwards, Research	4,200,000
Tax Credit Carryforward, Expiration Date	2034
State and Local Jurisdiction [Member]
Note 7 - Income Taxes (Details) [Line Items]
Operating Loss Carryforwards		10,400,000
Operating Loss Carryforwards, Expiration Date	2034
Deferred Tax Assets, Tax Credit Carryforwards, Research	5,100,000
Tax Credit Carryforward, Expiration Date	2020
Research and Development Tax Credits Expiring in 2020	$ 284,000