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Note 15 - Shareholder Rights Plan	12 Months Ended
Note 15 - Shareholder Rights Plan	Dec. 31, 2018
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	15. Shareholder Rights Plan On April 4, 2008, the Board of Directors of the Company adopted a Shareholder Rights Plan (the “2008 Plan”). The 2008 Plan expired on April 8, 2018, and the Company did not extend the 2008 Plan or adopt a new Shareholder Rights Plan.