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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ / shares in Thousands
Jun. 30, 2019
Dec. 31, 2018
Cash and cash equivalents $ 178,298 $ 428,150
Allowance for doubtful accounts 8,398,010 10,830,555
Inventories, net 19,266,094 20,007,488
Prepaid expenses 385,399 858,158
Office furniture and equipment 2,685,450 2,649,280
Goodwill 0 1,473,176
Checks written in excess of bank balance 1,030,369 636,142
Trade payables 8,678,165 6,679,670
Line of credit 12,429,643 16,582,963
Accrued liabilities 1,285,064 1,866,796
Notes payable $ 743,675 $ 399,912
Preferred stock, par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized (in shares) 3,000,000 3,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 15,000,000 15,000,000
Common stock, shares issued (in shares) 3,879,608 3,879,608
Common stock, shares outstanding (in shares) 3,835,950 3,835,950
Treasury stock, shares (in shares) 43,658 43,658
Variable Interest Entity, Primary Beneficiary [Member]    
Cash and cash equivalents $ 2,000 $ 57,000
Allowance for doubtful accounts 515,000 85,000
Inventories, net 242,000 340,000
Prepaid expenses 106,000 127,000
Office furniture and equipment 303,000 303,000
Accumulated depreciation and amortization 107,000 104,000
Goodwill 0 440,000
Checks written in excess of bank balance 2,000 7,000
Trade payables 77,000 62,000
Line of credit 232,000 267,000
Accrued liabilities 35,000 89,000
Notes payable $ 30,000 $ 27,000