Note 11 - Debt and Other Financing Arrangements (Details Textual) - USD ($) $ in Thousands				12 Months Ended			68 Months Ended
	May 01, 2020	Dec. 02, 2019	Oct. 30, 2017	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 04, 2019
Interest Expense, Total				$ 32	$ 49	$ 75
Paycheck Protection Program CARES Act [Member]
Proceeds from Issuance of Long-term Debt, Total	$ 2,100			0	0	$ 2,181
Banc of America Leasing and Capital [Member] | Equipment Loan Arrangement [Member] | Line of Credit [Member]
Interest Expense, Total		$ 16,000		32
Debt Instrument, Term (Month)		60 months
Debt Instrument, Interest Rate, Stated Percentage		3.79%
Proceeds from Issuance of Long-term Debt, Total							$ 12,200
Repayments of Long-term Debt, Total				700	$ 700
Long-Term Debt, Total				$ 600
Long-Term Debt, Weighted Average Interest Rate, over Time				3.70%
Debt, Weighted Average Interest Rate				3.80%
Banc of America Leasing and Capital [Member] | Equipment Loan Arrangement [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			1.75%