Note 3 - Quarterly Results of Operations (Unaudited): Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Details
Net Sales	$ 13,575	$ 12,955	$ 13,428	$ 12,323	$ 12,914	$ 12,572	$ 12,604	$ 10,964	$ 12,010	$ 10,479	$ 8,787	$ 10,902	$ 52,281	$ 49,054	$ 42,178
Gross Profit	8,327	8,186	8,151	7,533	8,112	8,073	7,785	6,947	7,265	6,497	4,950	6,836	32,196	30,917	25,548
Net Income	$ 4,555	$ 4,280	$ 4,103	$ 3,534	$ 4,131	$ 4,206	$ 3,426	$ 3,024	$ 3,412	$ 2,933	$ 1,313	$ 3,140	$ 16,473	$ 14,788	$ 10,798
Earnings Per Share Diluted	$ 1.25	$ 1.18	$ 1.12	$ 0.96	$ 1.13	$ 1.15	$ 0.94	$ 0.83	$ 0.94	$ 0.80	$ 0.36	$ 0.84	$ 4.52	$ 4.04	$ 2.94