Note 7 - Commitments and Contingencies (Details Textual) SFr in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2002	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 CHF (SFr)	Aug. 31, 2014 ft²
Royalty Payment, Percentage of Net Sales	2.50%
Area of Real Estate Property | ft²						5,000
Operating Leases, Rent Expense | $		$ 200,000	$ 200,000	$ 200,000
Security Deposit | $		14,000
Letters of Credit Outstanding, Amount | $		14,000	14,000
Loans Pledged as Collateral | $		14,000	$ 14,000
Inventories [Member]
Purchase Commitment, Amount Executed | SFr					SFr 1.9
Inventories [Member] | Accrued Expenses [Member]
Purchase Commitment, Amount Executed | SFr					0.9
Acquisition of Raw Materials [Member]
Purchase Commitment, Amount Executed | SFr					1.0
Acquisition of Raw Materials [Member] | Accrued Expenses [Member]
Purchase Commitment, Amount Executed | SFr					0.2
Inventories, Four Batches [Member]
Purchase Commitment, Amount Executed		$ 7,500,000			SFr 7.6