Note 12 - Treasury Stock Transactions (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Aug. 09, 2016	Oct. 28, 2013
Treasury Stock, Value, Acquired, Cost Method	$ 365	$ 4,257
Stock Repurchase Program 2013 [Member]
Stock Repurchase Program, Authorized Amount				$ 5,000
Stock Repurchase Program, 2016 [Member]
Stock Repurchase Program, Authorized Amount			$ 5,000
Treasury Stock, Shares, Acquired	59,312	701,114
Treasury Stock Acquired, Average Cost Per Share	$ 5.54	$ 6.07
Treasury Stock, Value, Acquired, Cost Method		$ 4,300
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 2,500