Note 13 - Accrued Liabilities - Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accrued payroll	$ 9,695	$ 11,009
Accrued employee benefits	2,906	2,288
Accrued state and local taxes	962	1,215
Accrued interest	232	1,208
Advance payments	404	312
Accrued product warranty	977	821
Accrued commission expenses	1,077	420
Accrued professional fees	272	222
Accrued utility expenses	105	155
Accrued other	896	214
Total accrued liabilities	$ 17,526	$ 17,864