Note 9 - Line of Credit (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Feb. 20, 2009
Long-term Line of Credit, Noncurrent	$ 14,311	$ 21,000
Letters of Credit Outstanding, Amount	$ 800	800
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 35,000
Debt Instrument, Interest Rate, Effective Percentage	2.30%
Long-term Line of Credit, Noncurrent	$ 14,300	$ 21,000
Line of Credit Facility, Remaining Borrowing Capacity	$ 19,900
Line of Credit Facility, Expiration Date	Dec. 11, 2019
Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 5,000