Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands	Mar. 31, 2019	Dec. 31, 2018
Cash and cash equivalents	$ 175,442	$ 428,150
Allowance for doubtful accounts	92,000	85,000
Inventories, net	20,837,907	20,007,488
Prepaid expenses	646,164	858,158
Office furniture and equipment	2,656,519	2,649,280
Goodwill	1,473,176	1,473,176
Checks written in excess of bank balance	654,646	636,142
Trade payables	8,680,004	6,679,670
Line of credit	15,351,709	16,582,963
Accrued liabilities	2,082,161	1,866,796
Notes payable	$ 639,327	$ 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)	3,779,608	3,779,608
Common stock, shares outstanding (in shares)	3,730,950	3,730,950
Treasury stock, shares (in shares)	43,658	43,658
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Cash and cash equivalents	$ 3,000	$ 57,000
Inventories, net	315,000	340,000
Prepaid expenses	106,000	127,000
Office furniture and equipment	303,000	303,000
Accumulated depreciation and amortization	106,000	104,000
Goodwill	440,000	440,000
Checks written in excess of bank balance	4,000	7,000
Trade payables	142,000	62,000
Line of credit	249,000	267,000
Accrued liabilities	47,000	89,000
Notes payable	$ 30,000	$ 27,000