Note 7 - Debt and Other Financing Arrangements (Details Textual) - Line of Credit [Member] - Equipment Loan Arrangement [Member] - Banc of America Leasing and Capital [Member] $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)
Long-Term Debt, Weighted Average Interest Rate, over Time	3.60%	3.60%
Interest Expense, Total	$ 8	$ 18
Long-Term Debt, Total	$ 915	$ 915