Note 13 - Accrued Liabilities - Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accrued payroll	$ 5,467	$ 11,009
Accrued employee benefits	2,325	2,288
Accrued state and local taxes	181	1,215
Accrued interest	210	1,208
Advance payments	310	312
Accrued product warranty	661	821
Accrued commission expenses	688	420
Accrued professional fees	296	222
Accrued capital expenditures	9	0
Accrued other	530	369
Total accrued liabilities	$ 10,677	$ 17,864