Note 3 - Restructuring and Other Charges (Details Textual) - USD ($) $ in Thousands			9 Months Ended
	Jul. 19, 2021	Jun. 10, 2021	Sep. 30, 2021	Sep. 30, 2020
Incremental Sublease Income Above Impairment Charge	$ 350
Employee Severance [Member]
Restructuring Charges, Total			$ 120
Severance and Other One-Time Termination Benefits [Member]
Restructuring Charges, Total				$ 207
Resignation of Chief Financial Officer [Member]
Restructuring Charges, Total				133
Headcount Reductions and Employee Relocation [Member]
Restructuring Charges, Total				46
EMS Segment Restructuring and Facility Consolidation [Member]
Restructuring Charges, Total				14
Other Restructuring [Member]
Restructuring Charges, Total				$ 14
EMS Segment Restructuring and Facility Consolidation [Member]
Restructuring and Related Costs, Incurred Cost, Total			183
EMS Segment Restructuring and Facility Consolidation [Member] | Employee Severance [Member]
Restructuring Charges, Total			0
Executive Management Changes [Member]
Restructuring and Related Costs, Incurred Cost, Total			370
Executive Management Changes [Member] | Employee Severance [Member]
Restructuring and Related Costs, Incurred Cost, Total		$ 120	120
Restructuring Charges, Total			120
Executive Management Changes [Member] | Employee Severance [Member] | Restructuring and Other Charges [Member]
Restructuring and Related Costs, Incurred Cost, Total			120
Executive Management Changes [Member] | Legal Fees [Member]
Restructuring and Related Costs, Incurred Cost, Total			159
Stock-based Compensation Expense [Member] | Modification Cost [Member]
Restructuring and Related Costs, Incurred Cost, Total			$ 91