Note 4 - Financing Arrangements - Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Real estate term notes bearing interest at one-month LIBOR + 2.25% (3.3% and 4.1% as of March 31, 2020 and December 31, 2019, respectively) maturing June 15, 2022 with monthly payments of approximately $41 plus interest secured by substantially all assets.	$ 3,631	$ 3,755
Debt issuance Costs	(118)	(132)
Total long-term debt	3,513	3,623
Current maturities of long-term debt	(444)	(444)	[1]
Long-term debt - net of current maturities	3,069	3,179
Real Estate Term Note [Member]
Real estate term notes bearing interest at one-month LIBOR + 2.25% (3.3% and 4.1% as of March 31, 2020 and December 31, 2019, respectively) maturing June 15, 2022 with monthly payments of approximately $41 plus interest secured by substantially all assets.	$ 3,631	$ 3,755

[1] The balance sheet at December 31, 2019 has been derived from the audited financial statements at that date