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Note 15 - Other Income (Details Textual) - Other Nonoperating Income (Expense) [Member] - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Recognized for Merchant Deposit Reserves Reversed $ 1,100,000  
Income from Reversal of Accounts Payable Previously Recorded, Not Deemed to Be Payable   $ 675,000