Note 4 - Commitments and Contingencies (Details Textual)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Number of Operating Leases	2
Operating Leases, Rent Expense, Net	$ 415,000	$ 384,000
Minimum [Member]
Lessor Leasing Arrangements, Operating Leases, Renewal Term	1 year
Maximum [Member]
Lessor Leasing Arrangements, Operating Leases, Renewal Term	2 years