Note 3 - Significant Accounting Policies - Cash Distribution for Federal Income Tax Purposes (Details)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Ordinary income		50.00%
Capital gain
Return of capital	100.00%	50.00%	100.00%
Total	100.00%	100.00%	100.00%

Return of capital (ROC) refers to principal payments back to "capital owners" (shareholders, partners, unitholders) that exceed the growth (net income/taxable income) of a business or investment. It should not be confused with Rate of Return (ROR), which measures a gain or loss on an investment.

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