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Note 6 - Revenues - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Balance | $ 1,102 | $ 1,109 | $ 585 | $ 602
Unbilled | 237 | 305 | 1,802 | 1,950
Billings | (500) | (548) | (1,548) | (1,686)
Balance | 839 | 866 | 839 | 866
Balance |  |  | 3,200 |
Billings | 500 | 548 | 1,548 | 1,686
Balance | 4,400 |  | 4,400 |
Deferred Membership Dues [Member] |  |  |  |
Billings | (730) | (787) | (6,178) | (5,428)
Balance | 5,376 | 4,776 | 3,196 | 3,153
Billings | 730 | 787 | 6,178 | 5,428
Revenue recognized | (1,684) | (1,522) | (4,952) | (4,540)
Balance | 4,422 | 4,041 | 4,422 | 4,041
Customer Advance Deposits [Member] |  |  |  |
Billings | (588) | (261) | (1,299) | (656)
Balance | 784 | 652 | 674 | 553
Billings | 588 | 261 | 1,299 | 656
Revenue recognized | (688) | (301) | (1,289) | (597)
Balance | $ 684 | $ 612 | $ 684 | $ 612

X
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130533-203044 + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044 + Details
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