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Note 1 - Summary of Significant Accounting Policies - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Total carrying amount of long-term debt	$ 28,691	$ 30,713
Estimated fair value of long-term debt	30,303	32,943
Fair Value, Recurring [Member]
Assets, fair value	5,646	5,015
Money Market Funds [Member] \| Fair Value, Recurring [Member]
Assets, fair value	5,646	5,015
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Assets, fair value	5,646	5,015
Fair Value, Inputs, Level 1 [Member] \| Money Market Funds [Member] \| Fair Value, Recurring [Member]
Assets, fair value	$ 5,646	$ 5,015

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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