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Note 15 - Fair Value Measurements (Details Textual)	Dec. 31, 2020 USD ($)
Fair Value, Inputs, Level 2 [Member]
Long-term Debt, Total	$ 200,000

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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