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Note 10 - Shareholders' Equity - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jan. 03, 2011
Mar. 07, 2008
Dec. 31, 2015
Dec. 31, 2014
Note 10 - Shareholders Equity - Stock Option Activity Details        
Shares under option - beginning     2,056,122 2,131,622
Options granted     411,250 252,500
Options exercised     (137,937) (3,067)
Options forfeited or expired     (71,466) (324,933)
Shares under option - ending     2,257,969 2,056,122
Shares under option - exercisable - ending     1,255,736 1,296,619
Shares under option vested and expected to vest - ending     2,093,294 1,957,633
Weighted average exercise price per share of options outstanding - beginning     $ 6.66 $ 6.99
Weighted average exercise price per share of options granted 50,000 50,000 4.68 3.94
Weighted average exercise price per share of options exercised     $ 3.9 $ 3.67
Weighted average exercise price per share of options forfeited or expired     11.86 6.77
Weighted average exercise price per share of options outstanding - ending     6.30 6.66
Weighted average exercise price per share of options exercisable - ending     5.22 5.63
Weighted average exercise price per share of options vested and expected to vest - ending     $ 6.45 $ 5.33
Weighted average remaining contractual term of options outstanding - ending     3 years 208 days 3 years 292 days
Weighted average remaining contractual term of options exercisable - ending     2 years 161 days 3 years 256 days
Weighted average remaining contractual term of options vested and expected to vest - ending     3 years 142 days 3 years 7 days
Shares under option - ending - aggregate intrinsic value     $ 3,094 $ 0
Shares exercisable - ending - aggregate intrinsic value     1,786 0
Shares vested and expected to vest - aggregate intrinsic value     $ 2,731 $ 0