Note 8 - Debt and Other Financing Arrangements (Details Textual) - Banc of America Leasing and Capital [Member] - Equipment Loan Arrangement [Member] - Line of Credit [Member] $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)
Long-term Debt, Weighted Average Interest Rate, over Time	2.80%	3.50%
Interest Expense, Total	$ 19	$ 44
Debt, Weighted Average Interest Rate	3.30%	3.30%
Long-term Debt, Total	$ 2,300	$ 2,300