Note 4 - Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accrued payroll and employee benefits	$ 363	$ 291
Accrued bonus expense	302	290
Accrued vacation expense	514	481
Accrued taxes	614	1,086
Accrued shipping expense	688	364
Other accrued expenses	481	358
Total Accrued Expenses	$ 2,962	$ 2,870