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(7) Shareholders' Equity (Details - Stock purchases) - Common Stock [Member] - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Class of Stock [Line Items] |  |
Total stock purchases, shares | 351,926 | 378,470
Total stock purchases, average price per share | $ 3.45 | $ 3.97
Open Market Purchases [Member] |  |
Class of Stock [Line Items] |  |
Total stock purchases, shares | 105,017 | 335,546
Total stock purchases, average price per share | $ 3.60 | $ 3.95
Shares Redeemed [Member] |  |
Class of Stock [Line Items] |  |
Total stock purchases, shares | 46,909 | 18,424
Total stock purchases, average price per share | $ 2.86 | $ 3.76
Other Repurchases [Member] |  |
Class of Stock [Line Items] |  |
Total stock purchases, shares | 200,000 | 24,500
Total stock purchases, average price per share | $ 3.51 | $ 4.20

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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